diff --git a/devtools/test_dashboard/devtools.js b/devtools/test_dashboard/devtools.js
index 6a779e9656e..1b79674e91f 100644
--- a/devtools/test_dashboard/devtools.js
+++ b/devtools/test_dashboard/devtools.js
@@ -17,8 +17,7 @@ var Tabs = {
         Plotly.setPlotConfig({
 
             // use local topojson files
-            topojsonURL: '../../node_modules/sane-topojson/dist/',
-
+            topojsonURL: "../../dist/topojson/",
             // register mapbox access token
             // run `npm run preset` if you haven't yet
             mapboxAccessToken: credentials.MAPBOX_ACCESS_TOKEN,
diff --git a/package-lock.json b/package-lock.json
index 1d5b49b4cca..f3038c4d215 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -65,6 +65,7 @@
       },
       "devDependencies": {
         "@biomejs/biome": "1.8.3",
+        "@turf/simplify": "^7.2.0",
         "amdefine": "^1.0.1",
         "assert": "^2.1.0",
         "browserify-transform-tools": "^1.7.0",
@@ -102,6 +103,7 @@
         "karma-viewport": "1.0.2",
         "lodash": "^4.17.21",
         "madge": "^8.0.0",
+        "mapshaper": "^0.6.102",
         "mathjax-v2": "npm:mathjax@2.7.5",
         "mathjax-v3": "npm:mathjax@^3.2.2",
         "minify-stream": "^2.1.0",
@@ -1001,6 +1003,84 @@
       "resolved": "https://registry.npmjs.org/tinyqueue/-/tinyqueue-3.0.0.tgz",
       "integrity": "sha512-gRa9gwYU3ECmQYv3lslts5hxuIa90veaEcxDYuu3QGOIAEM2mOZkVHp48ANJuu1CURtRdHKUBY5Lm1tHV+sD4g=="
     },
+    "node_modules/@msgpackr-extract/msgpackr-extract-darwin-arm64": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-darwin-arm64/-/msgpackr-extract-darwin-arm64-3.0.3.tgz",
+      "integrity": "sha512-QZHtlVgbAdy2zAqNA9Gu1UpIuI8Xvsd1v8ic6B2pZmeFnFcMWiPLfWXh7TVw4eGEZ/C9TH281KwhVoeQUKbyjw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ]
+    },
+    "node_modules/@msgpackr-extract/msgpackr-extract-darwin-x64": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-darwin-x64/-/msgpackr-extract-darwin-x64-3.0.3.tgz",
+      "integrity": "sha512-mdzd3AVzYKuUmiWOQ8GNhl64/IoFGol569zNRdkLReh6LRLHOXxU4U8eq0JwaD8iFHdVGqSy4IjFL4reoWCDFw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ]
+    },
+    "node_modules/@msgpackr-extract/msgpackr-extract-linux-arm": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-linux-arm/-/msgpackr-extract-linux-arm-3.0.3.tgz",
+      "integrity": "sha512-fg0uy/dG/nZEXfYilKoRe7yALaNmHoYeIoJuJ7KJ+YyU2bvY8vPv27f7UKhGRpY6euFYqEVhxCFZgAUNQBM3nw==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@msgpackr-extract/msgpackr-extract-linux-arm64": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-linux-arm64/-/msgpackr-extract-linux-arm64-3.0.3.tgz",
+      "integrity": "sha512-YxQL+ax0XqBJDZiKimS2XQaf+2wDGVa1enVRGzEvLLVFeqa5kx2bWbtcSXgsxjQB7nRqqIGFIcLteF/sHeVtQg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@msgpackr-extract/msgpackr-extract-linux-x64": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-linux-x64/-/msgpackr-extract-linux-x64-3.0.3.tgz",
+      "integrity": "sha512-cvwNfbP07pKUfq1uH+S6KJ7dT9K8WOE4ZiAcsrSes+UY55E/0jLYc+vq+DO7jlmqRb5zAggExKm0H7O/CBaesg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@msgpackr-extract/msgpackr-extract-win32-x64": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-win32-x64/-/msgpackr-extract-win32-x64-3.0.3.tgz",
+      "integrity": "sha512-x0fWaQtYp4E6sktbsdAqnehxDgEc/VwM7uLsRCYWaiGu0ykYdZPiS8zCWdnjHwyiumousxfBm4SO31eXqwEZhQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -1045,6 +1125,12 @@
         "node": ">=14"
       }
     },
+    "node_modules/@placemarkio/tokml": {
+      "version": "0.3.7",
+      "resolved": "https://registry.npmjs.org/@placemarkio/tokml/-/tokml-0.3.7.tgz",
+      "integrity": "sha512-pQaoQTBvDf7p7d/3ZHDaxWaU62guSYB9KQ6vvecshELunzpdN5tbgw0d+SVO1eYaTlrxX3Nvi7F9DI8FcoJePg==",
+      "dev": true
+    },
     "node_modules/@plotly/d3": {
       "version": "3.8.2",
       "resolved": "https://registry.npmjs.org/@plotly/d3/-/d3-3.8.2.tgz",
@@ -1126,6 +1212,18 @@
       "integrity": "sha512-+9jVqKhRSpsc591z5vX+X5Yyw+he/HCB4iQ/RYxw35CEPaY1gnsNE43nf9n9AaYjAQrTiI/mOwKUKdUs9vf7Xg==",
       "dev": true
     },
+    "node_modules/@tmcw/togeojson": {
+      "version": "5.8.1",
+      "resolved": "https://registry.npmjs.org/@tmcw/togeojson/-/togeojson-5.8.1.tgz",
+      "integrity": "sha512-2YNrbis3l5kS0XrYwiHEZcGwiRp0MJ5CvwGwtMWp2z2tsVlskeec2qgvKHnF0RCwI5GnjrrBOoKsWfndEnd3LA==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      },
+      "peerDependencies": {
+        "@types/geojson": "*"
+      }
+    },
     "node_modules/@ts-graphviz/adapter": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/@ts-graphviz/adapter/-/adapter-2.0.3.tgz",
@@ -1257,38 +1355,105 @@
         "url": "https://opencollective.com/turf"
       }
     },
+    "node_modules/@turf/clean-coords": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@turf/clean-coords/-/clean-coords-7.2.0.tgz",
+      "integrity": "sha512-+5+J1+D7wW7O/RDXn46IfCHuX1gIV1pIAQNSA7lcDbr3HQITZj334C4mOGZLEcGbsiXtlHWZiBtm785Vg8i+QQ==",
+      "dev": true,
+      "dependencies": {
+        "@turf/helpers": "^7.2.0",
+        "@turf/invariant": "^7.2.0",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@turf/clone": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@turf/clone/-/clone-7.2.0.tgz",
+      "integrity": "sha512-JlGUT+/5qoU5jqZmf6NMFIoLDY3O7jKd53Up+zbpJ2vzUp6QdwdNzwrsCeONhynWM13F0MVtPXH4AtdkrgFk4g==",
+      "dev": true,
+      "dependencies": {
+        "@turf/helpers": "^7.2.0",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
     "node_modules/@turf/helpers": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@turf/helpers/-/helpers-7.1.0.tgz",
-      "integrity": "sha512-dTeILEUVeNbaEeoZUOhxH5auv7WWlOShbx7QSd4s0T4Z0/iz90z9yaVCtZOLbU89umKotwKaJQltBNO9CzVgaQ==",
-      "license": "MIT",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@turf/helpers/-/helpers-7.2.0.tgz",
+      "integrity": "sha512-cXo7bKNZoa7aC7ydLmUR02oB3IgDe7MxiPuRz3cCtYQHn+BJ6h1tihmamYDWWUlPHgSNF0i3ATc4WmDECZafKw==",
       "dependencies": {
         "@types/geojson": "^7946.0.10",
-        "tslib": "^2.6.2"
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@turf/invariant": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@turf/invariant/-/invariant-7.2.0.tgz",
+      "integrity": "sha512-kV4u8e7Gkpq+kPbAKNC21CmyrXzlbBgFjO1PhrHPgEdNqXqDawoZ3i6ivE3ULJj2rSesCjduUaC/wyvH/sNr2Q==",
+      "dev": true,
+      "dependencies": {
+        "@turf/helpers": "^7.2.0",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
       },
       "funding": {
         "url": "https://opencollective.com/turf"
       }
     },
     "node_modules/@turf/meta": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@turf/meta/-/meta-7.1.0.tgz",
-      "integrity": "sha512-ZgGpWWiKz797Fe8lfRj7HKCkGR+nSJ/5aKXMyofCvLSc2PuYJs/qyyifDPWjASQQCzseJ7AlF2Pc/XQ/3XkkuA==",
-      "license": "MIT",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@turf/meta/-/meta-7.2.0.tgz",
+      "integrity": "sha512-igzTdHsQc8TV1RhPuOLVo74Px/hyPrVgVOTgjWQZzt3J9BVseCdpfY/0cJBdlSRI4S/yTmmHl7gAqjhpYH5Yaw==",
       "dependencies": {
-        "@turf/helpers": "^7.1.0",
+        "@turf/helpers": "^7.2.0",
         "@types/geojson": "^7946.0.10"
       },
       "funding": {
         "url": "https://opencollective.com/turf"
       }
     },
+    "node_modules/@turf/simplify": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@turf/simplify/-/simplify-7.2.0.tgz",
+      "integrity": "sha512-9YHIfSc8BXQfi5IvEMbCeQYqNch0UawIGwbboJaoV8rodhtk6kKV2wrpXdGqk/6Thg6/RWvChJFKVVTjVrULyQ==",
+      "dev": true,
+      "dependencies": {
+        "@turf/clean-coords": "^7.2.0",
+        "@turf/clone": "^7.2.0",
+        "@turf/helpers": "^7.2.0",
+        "@turf/meta": "^7.2.0",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
     "node_modules/@types/bluebird": {
       "version": "3.5.36",
       "resolved": "https://registry.npmjs.org/@types/bluebird/-/bluebird-3.5.36.tgz",
       "integrity": "sha512-HBNx4lhkxN7bx6P0++W8E289foSu8kO8GCk2unhuVggO+cE7rh9DhZUyPhUxNRG9m+5B5BTKxZQ5ZP92x/mx9Q==",
       "dev": true
     },
+    "node_modules/@types/concat-stream": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/@types/concat-stream/-/concat-stream-1.6.1.tgz",
+      "integrity": "sha512-eHE4cQPoj6ngxBZMvVf6Hw7Mh4jMW4U9lpGmS5GBPB9RYxlFg+CHaVN7ErNY4W9XfLIEn20b4VDYaIrbq0q4uA==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/cookie": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
@@ -1310,6 +1475,15 @@
       "integrity": "sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==",
       "peer": true
     },
+    "node_modules/@types/form-data": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-0.0.33.tgz",
+      "integrity": "sha512-8BSvG1kGm83cyJITQMZSulnl6QV8jqAGreJsc5tPu1Jq0vTSOiY/k24Wx82JRpWwZSqrala6sd5rWi6aNXvqcw==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/geojson": {
       "version": "7946.0.14",
       "resolved": "https://registry.npmjs.org/@types/geojson/-/geojson-7946.0.14.tgz",
@@ -1368,6 +1542,12 @@
       "resolved": "https://registry.npmjs.org/@types/pbf/-/pbf-3.0.5.tgz",
       "integrity": "sha512-j3pOPiEcWZ34R6a6mN07mUkM4o4Lwf6hPNt8eilOeZhTFbxFXmKhvXl9Y28jotFPaI1bpPDJsbCprUoNke6OrA=="
     },
+    "node_modules/@types/qs": {
+      "version": "6.9.18",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.18.tgz",
+      "integrity": "sha512-kK7dgTYDyGqS+e2Q4aK9X3D7q234CIZ1Bv0q/7Z5IwRDoADNU81xXJK/YVyLbLTZCoIwUoDoffFeF+p/eIklAA==",
+      "dev": true
+    },
     "node_modules/@types/sass": {
       "version": "1.45.0",
       "resolved": "https://registry.npmjs.org/@types/sass/-/sass-1.45.0.tgz",
@@ -1698,6 +1878,15 @@
         "@xtuc/long": "4.2.2"
       }
     },
+    "node_modules/@xmldom/xmldom": {
+      "version": "0.8.10",
+      "resolved": "https://registry.npmjs.org/@xmldom/xmldom/-/xmldom-0.8.10.tgz",
+      "integrity": "sha512-2WALfTl4xo2SkGCYRt6rDTFfk9R1czmBvUQy12gK2KuRKIpWEhcbbzy8EZXtz/jkRqHX8bFEc6FC1HjX4TUWYw==",
+      "dev": true,
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/@xtuc/ieee754": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/@xtuc/ieee754/-/ieee754-1.2.0.tgz",
@@ -1764,6 +1953,15 @@
         "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
+    "node_modules/adm-zip": {
+      "version": "0.5.16",
+      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.5.16.tgz",
+      "integrity": "sha512-TGw5yVi4saajsSEgz25grObGHEUaDrniwvA2qwSC060KfqGPdglhvPMA2lPIoxs3PQIItj2iag35fONcQqgUaQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=12.0"
+      }
+    },
     "node_modules/agent-base": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
@@ -1955,6 +2153,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha512-BSHWgDSAiKs50o2Re8ppvp3seVHXSRM44cdSsT9FfNEUUZLOGWVCsiWaRPWM1Znn+mqZ1OfVZ3z3DWEzSp7hRA==",
+      "dev": true
+    },
     "node_modules/assert": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/assert/-/assert-2.1.0.tgz",
@@ -2330,6 +2534,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/call-bind-apply-helpers": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
+      "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
+      "dev": true,
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/caniuse-lite": {
       "version": "1.0.30001651",
       "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001651.tgz",
@@ -2373,6 +2590,12 @@
         "element-size": "^1.1.1"
       }
     },
+    "node_modules/caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha512-4tYFyifaFfGacoiObjJegolkwSU4xQNGbVgUiNYVUxbQ2x2lUsFvY4hVgVzGiIe6WLOPqycWXA40l+PWsxthUw==",
+      "dev": true
+    },
     "node_modules/chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -2867,6 +3090,19 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/cookies": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/cookies/-/cookies-0.8.0.tgz",
+      "integrity": "sha512-8aPsApQfebXnuI+537McwYsDtjVxGm8gTIzQI3FDW6t5t/DAhERxtnbEPN/8RX+uZthoz4eCOgloXaE5cYyNow==",
+      "dev": true,
+      "dependencies": {
+        "depd": "~2.0.0",
+        "keygrip": "~1.1.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -3148,6 +3384,19 @@
       "resolved": "https://registry.npmjs.org/d3-quadtree/-/d3-quadtree-1.0.7.tgz",
       "integrity": "sha512-RKPAeXnkC59IDGD0Wu5mANy0Q2V28L+fNe65pOCXVdVuTJS3WPKaJlFHer32Rbh9gIo9qMuJXio8ra4+YmIymA=="
     },
+    "node_modules/d3-scale-chromatic": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-scale-chromatic/-/d3-scale-chromatic-3.0.0.tgz",
+      "integrity": "sha512-Lx9thtxAKrO2Pq6OO2Ua474opeziKr279P/TKZsMAhYyNDD3EnCffdbgeSYN5O7m2ByQsxtuP2CSDczNUIZ22g==",
+      "dev": true,
+      "dependencies": {
+        "d3-color": "1 - 3",
+        "d3-interpolate": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/d3-shape": {
       "version": "1.3.7",
       "resolved": "https://registry.npmjs.org/d3-shape/-/d3-shape-1.3.7.tgz",
@@ -3339,6 +3588,15 @@
       "resolved": "https://registry.npmjs.org/defined/-/defined-1.0.0.tgz",
       "integrity": "sha1-yY2bzvdWdBiOEQlpFRGZ45sfppM="
     },
+    "node_modules/delaunator": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/delaunator/-/delaunator-5.0.1.tgz",
+      "integrity": "sha512-8nvh+XBe96aCESrGOqMp/84b13H9cdKbG5P2ejQCh4d4sK9RL4371qou9drQjMhvnPmhWl5hnmqbEE0fXr9Xnw==",
+      "dev": true,
+      "dependencies": {
+        "robust-predicates": "^3.0.2"
+      }
+    },
     "node_modules/delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
@@ -3625,6 +3883,20 @@
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     "node_modules/ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
       "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
+    "node_modules/msgpackr": {
+      "version": "1.11.2",
+      "resolved": "https://registry.npmjs.org/msgpackr/-/msgpackr-1.11.2.tgz",
+      "integrity": "sha512-F9UngXRlPyWCDEASDpTf6c9uNhGPTqnTeLVt7bN+bU1eajoR/8V9ys2BRaV5C/e5ihE6sJ9uPIKaYt6bFuO32g==",
+      "dev": true,
+      "optionalDependencies": {
+        "msgpackr-extract": "^3.0.2"
+      }
+    },
+    "node_modules/msgpackr-extract": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/msgpackr-extract/-/msgpackr-extract-3.0.3.tgz",
+      "integrity": "sha512-P0efT1C9jIdVRefqjzOQ9Xml57zpOXnIuS+csaB4MdZbTdmGDLo8XhzBG1N7aO11gKDDkJvBLULeFTo46wwreA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "optional": true,
+      "dependencies": {
+        "node-gyp-build-optional-packages": "5.2.2"
+      },
+      "bin": {
+        "download-msgpackr-prebuilds": "bin/download-prebuilds.js"
+      },
+      "optionalDependencies": {
+        "@msgpackr-extract/msgpackr-extract-darwin-arm64": "3.0.3",
+        "@msgpackr-extract/msgpackr-extract-darwin-x64": "3.0.3",
+        "@msgpackr-extract/msgpackr-extract-linux-arm": "3.0.3",
+        "@msgpackr-extract/msgpackr-extract-linux-arm64": "3.0.3",
+        "@msgpackr-extract/msgpackr-extract-linux-x64": "3.0.3",
+        "@msgpackr-extract/msgpackr-extract-win32-x64": "3.0.3"
+      }
+    },
     "node_modules/multipipe": {
       "version": "0.3.1",
       "resolved": "https://registry.npmjs.org/multipipe/-/multipipe-0.3.1.tgz",
@@ -7445,6 +7968,31 @@
         "webidl-conversions": "^3.0.0"
       }
     },
+    "node_modules/node-gyp-build-optional-packages": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/node-gyp-build-optional-packages/-/node-gyp-build-optional-packages-5.2.2.tgz",
+      "integrity": "sha512-s+w+rBWnpTMwSFbaE0UXsRlg7hU4FjekKU4eyAih5T8nJuNZT1nNsskXpxmeqSK9UzkBl6UgRlnKc8hz8IEqOw==",
+      "dev": true,
+      "optional": true,
+      "dependencies": {
+        "detect-libc": "^2.0.1"
+      },
+      "bin": {
+        "node-gyp-build-optional-packages": "bin.js",
+        "node-gyp-build-optional-packages-optional": "optional.js",
+        "node-gyp-build-optional-packages-test": "build-test.js"
+      }
+    },
+    "node_modules/node-gyp-build-optional-packages/node_modules/detect-libc": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.0.3.tgz",
+      "integrity": "sha512-bwy0MGW55bG41VqxxypOsdSdGqLwXPI/focwgTYCFMbdUiBAxLg9CFzG08sz2aqzknwiX7Hkl0bQENjg8iLByw==",
+      "dev": true,
+      "optional": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/node-releases": {
       "version": "2.0.18",
       "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.18.tgz",
@@ -7720,6 +8268,27 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/opn": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/opn/-/opn-5.5.0.tgz",
+      "integrity": "sha512-PqHpggC9bLV0VeWcdKhkpxY+3JTzetLSqTCWL/z/tFIbI6G8JCjondXklT1JinczLz2Xib62sSp0T/gKT4KksA==",
+      "dev": true,
+      "dependencies": {
+        "is-wsl": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/opn/node_modules/is-wsl": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-1.1.0.tgz",
+      "integrity": "sha512-gfygJYZ2gLTDlmbWMI0CE2MwnFzSN/2SZfkMlItC4K/JBlsWVDB0bO6XhqcY13YXE7iMcAJnzTCJjPiTeJJ0Mw==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
@@ -7900,6 +8469,12 @@
       "resolved": "https://registry.npmjs.org/parenthesis/-/parenthesis-3.1.7.tgz",
       "integrity": "sha512-iMtu+HCbLXVrpf6Ys/4YKhcFxbux3xK4ZVB9r+a2kMSqeeQWQoDNYlXIsOjwlT2ldYXZ3k5PVeBnYn7fbAo/Bg=="
     },
+    "node_modules/parse-cache-control": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parse-cache-control/-/parse-cache-control-1.0.1.tgz",
+      "integrity": "sha512-60zvsJReQPX5/QP0Kzfd/VrpjScIQ7SHBW6bFCYfEP+fp0Eppr1SHhIO5nd1PjZtvclzSzES9D/p5nFJurwfWg==",
+      "dev": true
+    },
     "node_modules/parse-ms": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/parse-ms/-/parse-ms-2.1.0.tgz",
@@ -8318,6 +8893,15 @@
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
       "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
     },
+    "node_modules/promise": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/promise/-/promise-8.3.0.tgz",
+      "integrity": "sha512-rZPNPKTOYVNEEKFaq1HqTgOwZD+4/YHS5ukLzQCypkj+OkYx7iv0mA91lJlpPPZ8vMau3IIGj5Qlwrx+8iiSmg==",
+      "dev": true,
+      "dependencies": {
+        "asap": "~2.0.6"
+      }
+    },
     "node_modules/protocol-buffers-schema": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/protocol-buffers-schema/-/protocol-buffers-schema-3.4.0.tgz",
@@ -8861,6 +9445,12 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.2.tgz",
+      "integrity": "sha512-IXgzBWvWQwE6PrDI05OvmXUIruQTcoMDzRsOd5CDvHCVLcLHMTSYvOK5Cm46kWqlV3yAbuSpBZdJ5oP5OUoStg==",
+      "dev": true
+    },
     "node_modules/rrweb-cssom": {
       "version": "0.7.1",
       "resolved": "https://registry.npmjs.org/rrweb-cssom/-/rrweb-cssom-0.7.1.tgz",
@@ -9672,6 +10262,26 @@
       "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
       "dev": true
     },
+    "node_modules/sync-request": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/sync-request/-/sync-request-5.0.0.tgz",
+      "integrity": "sha512-NKhEA4WacR3mRBIFz1niXrIUTrUVFtP2spzrLMINangebvJ/EFyVv+LMJKvVl6UIrJM4Fburnnj91lRnqb4WkA==",
+      "dev": true,
+      "dependencies": {
+        "http-response-object": "^3.0.1",
+        "sync-rpc": "^1.2.0",
+        "then-request": "^5.0.0"
+      }
+    },
+    "node_modules/sync-rpc": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/sync-rpc/-/sync-rpc-1.3.6.tgz",
+      "integrity": "sha512-J8jTXuZzRlvU7HemDgHi3pGnh/rkoqR/OZSjhTyyZrEkkYQbk7Z33AXp37mkPfPpfdOuj7Ex3H/TJM1z48uPQw==",
+      "dev": true,
+      "dependencies": {
+        "get-port": "^3.1.0"
+      }
+    },
     "node_modules/tapable": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.2.1.tgz",
@@ -9812,6 +10422,47 @@
         "node": ">=10"
       }
     },
+    "node_modules/then-request": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/then-request/-/then-request-5.0.0.tgz",
+      "integrity": "sha512-A3uIVLD33SAvB10PfsxLuQBMV8GVC/6xKBMPOvkJchi6251e5AMJ+Yy+RVKsVsnj0iYNhN2E5SkNSi58H19wsw==",
+      "dev": true,
+      "dependencies": {
+        "@types/concat-stream": "^1.6.0",
+        "@types/form-data": "0.0.33",
+        "@types/node": "^8.0.0",
+        "@types/qs": "^6.2.31",
+        "caseless": "~0.12.0",
+        "concat-stream": "^1.6.0",
+        "form-data": "^2.2.0",
+        "http-basic": "^6.0.0",
+        "http-response-object": "^3.0.1",
+        "promise": "^8.0.0",
+        "qs": "^6.4.0"
+      }
+    },
+    "node_modules/then-request/node_modules/@types/node": {
+      "version": "8.10.66",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.10.66.tgz",
+      "integrity": "sha512-tktOkFUA4kXx2hhhrB8bIFb5TbwzS4uOhKEmwiD+NoiL0qtP2OQ9mFldbgD4dV1djrlBYP6eBuQZiWjuHUpqFw==",
+      "dev": true
+    },
+    "node_modules/then-request/node_modules/form-data": {
+      "version": "2.5.3",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.5.3.tgz",
+      "integrity": "sha512-XHIrMD0NpDrNM/Ckf7XJiBbLl57KEhT3+i3yY+eWm+cqYZJQTZrKo8Y8AWKnuV5GT4scfuUGt9LzNoIx3dU1nQ==",
+      "dev": true,
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "es-set-tostringtag": "^2.1.0",
+        "mime-types": "^2.1.35",
+        "safe-buffer": "^5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.12"
+      }
+    },
     "node_modules/thenify": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
@@ -10066,10 +10717,18 @@
       }
     },
     "node_modules/tslib": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.3.tgz",
-      "integrity": "sha512-xNvxJEOUiWPGhUuUdQgAJPKOOJfGnIyKySOc09XkKsgdUV/3E2zvwZYdejjmRgPCgcym1juLH3226yA7sEFJKQ==",
-      "license": "0BSD"
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="
+    },
+    "node_modules/tsscmp": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
+      "integrity": "sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.6.x"
+      }
     },
     "node_modules/type": {
       "version": "1.2.0",
diff --git a/package.json b/package.json
index 02e3f4a1df2..cffbad2c7b0 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "use-draftlogs": "node tasks/use_draftlogs.js",
     "empty-draftlogs": "node tasks/empty_draftlogs.js",
     "empty-dist": "node tasks/empty_dist.js",
-    "build": "npm run empty-dist && npm run preprocess && npm run find-strings && npm run bundle && npm run extra-bundles && npm run locales && npm run schema dist && npm run stats",
+    "build": "npm run empty-dist && npm run preprocess && npm run build_topojson && npm run find-strings && npm run bundle && npm run extra-bundles && npm run locales && npm run schema dist && npm run stats",
     "regl-codegen": "node devtools/regl_codegen/server.mjs",
     "cibuild": "npm run empty-dist && npm run preprocess && node tasks/cibundle.mjs",
     "lint": "npx @biomejs/biome lint",
@@ -60,7 +60,10 @@
     "version": "npm run build && git add -A lib dist build src/version.js",
     "postversion": "node -e \"console.log('Version bumped and committed. If ok, run: git push && git push --tags')\"",
     "postpublish": "node tasks/sync_packages.js",
-    "postshrinkwrap": "chttps ."
+    "postshrinkwrap": "chttps .",
+    "get_geodata": "node tasks/topojson/get_geodata.mjs",
+    "process_geodata": "node tasks/topojson/process_geodata.mjs",
+    "build_topojson": "npm run get_geodata && npm run process_geodata"
   },
   "browserify": {
     "transform": [
@@ -124,6 +127,7 @@
   },
   "devDependencies": {
     "@biomejs/biome": "1.8.3",
+    "@turf/simplify": "^7.2.0",
     "amdefine": "^1.0.1",
     "assert": "^2.1.0",
     "browserify-transform-tools": "^1.7.0",
@@ -161,6 +165,7 @@
     "karma-viewport": "1.0.2",
     "lodash": "^4.17.21",
     "madge": "^8.0.0",
+    "mapshaper": "^0.6.102",
     "mathjax-v2": "npm:mathjax@2.7.5",
     "mathjax-v3": "npm:mathjax@^3.2.2",
     "minify-stream": "^2.1.0",
diff --git a/tasks/preprocess.js b/tasks/preprocess.js
index 2436d8add38..e9dc2780bd7 100644
--- a/tasks/preprocess.js
+++ b/tasks/preprocess.js
@@ -11,7 +11,6 @@ var updateVersion = require('./util/update_version');
 // main
 makeBuildCSS();
 exposePartsInLib();
-copyTopojsonFiles();
 updateVersion(constants.pathToPlotlyVersion);
 
 // convert scss to css to js and static css file
@@ -72,13 +71,3 @@ function writeLibFiles(obj) {
         );
     }
 }
-
-// copy topojson files from sane-topojson to dist/
-function copyTopojsonFiles() {
-    fs.copy(
-        constants.pathToTopojsonSrc,
-        constants.pathToTopojsonDist,
-        { clobber: true },
-        common.throwOnError
-    );
-}
diff --git a/tasks/topojson/config.mjs b/tasks/topojson/config.mjs
new file mode 100644
index 00000000000..e987c45344b
--- /dev/null
+++ b/tasks/topojson/config.mjs
@@ -0,0 +1,153 @@
+const source = {
+    coastlines: 'GEOA_simplified',
+    countries: 'BNDA_simplified',
+    land: 'countries',
+    ocean: 'GEOA_simplified',
+    waterbodies: 'WBYA_simplified'
+};
+
+const config = {
+    resolutions: [110, 50],
+    // This mapping is no longer used, but keeping for info
+    regionMapping: {
+        AFE: 'africa',
+        AFW: 'africa',
+        AFR: 'africa',
+        AME: 'americas',
+        NAM: 'north-america',
+        LAC: 'south-america',
+        ASI: 'asia',
+        EUR: 'europe',
+        OCE: 'oceania',
+        ANT: 'antarctica',
+        WORLD: 'world'
+    },
+    scopes: [
+        {
+            name: 'africa',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'georeg',
+                        values: ['AFE', 'AFR', 'AFW']
+                    }
+                ],
+                bounds: [-30, -50, 60, 50]
+            }
+        },
+        {
+            name: 'antarctica',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'georeg',
+                        values: ['ANT']
+                    }
+                ],
+                bounds: [-180, -90, 180, -50]
+            }
+        },
+        {
+            name: 'asia',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'georeg',
+                        values: ['ASI']
+                    }
+                ],
+                bounds: [15, -90, 180, 85]
+            }
+        },
+        {
+            name: 'europe',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'georeg',
+                        values: ['EUR']
+                    }
+                ],
+                bounds: [-30, 0, 60, 90]
+            }
+        },
+        {
+            name: 'north-america',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'georeg',
+                        values: ['AME']
+                    }
+                ],
+                excludedFeatures: [
+                    {
+                        key: 'intreg',
+                        values: ['South America']
+                    }
+                ],
+                bounds: [-180, 0, -45, 85]
+            }
+        },
+        {
+            name: 'oceania',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'georeg',
+                        values: ['OCE']
+                    }
+                ],
+                bounds: [-180, -50, 180, 25]
+            }
+        },
+        {
+            name: 'south-america',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'intreg',
+                        values: ['South America']
+                    }
+                ],
+                bounds: [-100, -70, -30, 25]
+            }
+        },
+        {
+            name: 'usa',
+            specs: {
+                source,
+                acceptedFeatures: [
+                    {
+                        key: 'iso3cd',
+                        values: ['USA']
+                    }
+                ],
+                bounds: [-180, 0, -45, 85]
+            }
+        },
+        {
+            name: 'world',
+            specs: {
+                source,
+                acceptedFeatures: [],
+                bounds: []
+            }
+        }
+    ],
+    simplifyTolerance: 0.01,
+    outputDirGeojson: './build/geodata/geojson',
+    outputDirTopojson: './dist/topojson',
+    inputDir: './build/geodata',
+    shapefiles: ['BNDA_simplified', 'GEOA_simplified', 'WBYA_simplified'],
+    downloadUrl: 'https://geoportal.un.org/arcgis/sharing/rest/content/items/f86966528d5943efbdb83fd521dc0943/data'
+};
+
+export default config;
diff --git a/tasks/topojson/geodata.zip b/tasks/topojson/geodata.zip
new file mode 100644
index 00000000000..9986b9a6178
Binary files /dev/null and b/tasks/topojson/geodata.zip differ
diff --git a/tasks/topojson/get_geodata.mjs b/tasks/topojson/get_geodata.mjs
new file mode 100644
index 00000000000..546b9ad8c52
--- /dev/null
+++ b/tasks/topojson/get_geodata.mjs
@@ -0,0 +1,38 @@
+import { exec } from 'child_process';
+import fs from 'fs';
+import { Readable } from 'stream';
+import { pipeline } from 'stream/promises';
+import config from './config.mjs';
+
+try {
+    // Download data from UN
+    const tasksPath = './tasks/topojson';
+    const outputPath = './build/geodata';
+    const archivePath = `${tasksPath}/geodata.zip`;
+
+    if (fs.existsSync(archivePath)) {
+        console.log('Data file already exists. Skipping download.');
+    } else {
+        console.log(`Downloading data from ${config.downloadUrl}`);
+        const unResponse = await fetch(config.downloadUrl);
+        if (!unResponse.ok || !unResponse.body) throw new Error(`Bad response: ${unResponse.status}`);
+
+        console.log('Processing data');
+        if (!fs.existsSync(archivePath)) fs.mkdirSync(archivePath, { recursive: true });
+        const file = fs.createWriteStream(archivePath);
+        await pipeline(Readable.fromWeb(unResponse.body), file);
+
+        console.log(`Download complete. File saved to: ${archivePath}`);
+    }
+
+    // Unzip archive
+    if (!fs.existsSync(outputPath)) fs.mkdirSync(outputPath, { recursive: true });
+    console.log('Unzipping shapefiles', `unzip -o ${archivePath} -d ${outputPath}`);
+    // Use the shell to handle unzipping
+    if (!fs.existsSync(outputPath)) fs.mkdirSync(outputPath, { recursive: true });
+    exec(`unzip -o ${archivePath} -d ${outputPath}`);
+
+    console.log(`Shapefiles unzipped to ${outputPath}`);
+} catch (error) {
+    console.error(`Error when downloading file!: ${error}`);
+}
diff --git a/tasks/topojson/process_geodata.mjs b/tasks/topojson/process_geodata.mjs
new file mode 100644
index 00000000000..0a7c1e5f8c2
--- /dev/null
+++ b/tasks/topojson/process_geodata.mjs
@@ -0,0 +1,172 @@
+import { simplify } from '@turf/simplify';
+import fs from 'fs';
+import mapshaper from 'mapshaper';
+import path from 'path';
+import config from './config.mjs';
+
+const { inputDir, resolutions, scopes, shapefiles, simplifyTolerance } = config;
+
+// Create output directories
+const outputDirGeojson = path.resolve(config.outputDirGeojson);
+if (!fs.existsSync(outputDirGeojson)) fs.mkdirSync(outputDirGeojson, { recursive: true });
+const outputDirTopojson = path.resolve(config.outputDirTopojson);
+if (!fs.existsSync(outputDirTopojson)) fs.mkdirSync(outputDirTopojson, { recursive: true });
+
+async function convertShpToGeo(filename) {
+    const inputFilePath = `${inputDir}/${filename}.shp`;
+    const outputFilePath = `${outputDirGeojson}/${filename}.geojson`;
+    const commands = `-i ${inputFilePath} -proj wgs84 -o format=geojson ${outputFilePath}`;
+    await mapshaper.runCommands(commands);
+
+    console.log(`GeoJSON saved to ${outputFilePath}`);
+}
+
+function getGeojsonFile(filename) {
+    console.log(`📂 Loading GeoJSON file ${filename}...`);
+    try {
+        return JSON.parse(fs.readFileSync(filename, 'utf8'));
+    } catch (err) {
+        console.error(`❌ Failed to load GeoJSON input file '${filename}':`, err.message);
+        process.exit(1);
+    }
+}
+
+function cleanGeojson(geojson) {
+    return geojson.features.filter((feature) => {
+        const hasValidProperties = feature.properties != null;
+        // Remove overlapping geometries (broader geographic regions & great lakes) identified as all rows with iso3cd == NULL.
+        const hasValidIso3 = feature.properties?.iso3cd !== null;
+        const hasValidGeometry = feature.geometry != null;
+
+        // Remove Hawaii with specific globalid as there is an overlapping geometry
+        const isHawaiiOverlap = feature.properties?.globalid === '{8B42E894-6AF5-4236-B04D-8F634A159724}';
+
+        return hasValidProperties && hasValidIso3 && hasValidGeometry && !isHawaiiOverlap;
+    });
+}
+
+function getScopedFeatures(geojson, acceptedFeatures, excludedFeatures) {
+    if (!acceptedFeatures.length) return geojson;
+
+    return geojson.filter((feature) => {
+        const hasAcceptedValue = acceptedFeatures.some(({ key, values }) =>
+            values.includes(feature?.properties?.[key])
+        );
+        const hasExcludedValue = excludedFeatures.some(({ key, values }) =>
+            values.includes(feature?.properties?.[key])
+        );
+
+        return hasAcceptedValue && !hasExcludedValue;
+    });
+}
+
+function saveGeojson(region, resolution, layer, geojson) {
+    try {
+        const regionDir = path.join(outputDirGeojson, `${region}_${resolution}m`);
+        const filePath = path.join(regionDir, `${layer}.geojson`);
+        if (!fs.existsSync(regionDir)) fs.mkdirSync(regionDir, { recursive: true });
+        fs.writeFileSync(filePath, JSON.stringify(geojson));
+        console.log(`🌐 Saved: ${filePath}`);
+        return filePath;
+    } catch (err) {
+        console.error(`❌ Failed to save Geojson for ${region} (${resolution}m):`, err.message);
+    }
+}
+
+async function createCountriesLayer({ acceptedFeatures, excludedFeatures, name, source }) {
+    console.log(`Building countries layer for '${name}'`);
+    const geojson = getGeojsonFile(`${outputDirGeojson}/${source.countries}.geojson`);
+    const cleanedFeatures = cleanGeojson(geojson);
+    const scopedFeatures = getScopedFeatures(cleanedFeatures, acceptedFeatures, excludedFeatures);
+
+    const featureCollection = { type: 'FeatureCollection', features: scopedFeatures };
+    const layer = 'countries';
+    // TODO: Verify resolution of UN geodata
+    // Save 50m resolution (raw)
+    saveGeojson(name, 50, layer, featureCollection);
+
+    // TODO: Verify tolerance to match 110m resolution
+    // Save 110m resolution (simplified)
+    const simplifiedFeatures = featureCollection.features.map((f) =>
+        simplify(f, { tolerance: simplifyTolerance, highQuality: true })
+    );
+    const simplifiedCollection = { type: 'FeatureCollection', features: simplifiedFeatures };
+    saveGeojson(name, 110, layer, simplifiedCollection);
+}
+
+async function createLandLayer({ name, source }) {
+    console.log(`Building land layer for '${name}'`);
+    for (const resolution of resolutions) {
+        const inputFilePath = `${outputDirGeojson}/${name}_${resolution}m/${source.land}.geojson`;
+        const outputFilePath = `${outputDirGeojson}/${name}_${resolution}m/land.geojson`;
+        const commands = `${inputFilePath} -dissolve -o ${outputFilePath}`;
+        await mapshaper.runCommands(commands);
+    }
+}
+
+async function createCoastlinesLayer({ bounds, name, source }) {
+    console.log(`Building coastlines layer for '${name}'`);
+    for (const resolution of resolutions) {
+        const inputFilePath = `${outputDirGeojson}/${source.coastlines}.geojson`;
+        const outputFilePath = `${outputDirGeojson}/${name}_${resolution}m/coastlines.geojson`;
+        const commands = `${inputFilePath} -lines ${bounds.length ? `-clip bbox=${bounds.join(',')}` : ''} -o ${outputFilePath}`;
+        await mapshaper.runCommands(commands);
+    }
+}
+
+async function createOceanLayer({ bounds, name, source }) {
+    console.log(`Building ocean layer for '${name}'`);
+    for (const resolution of resolutions) {
+        const inputFilePath = `./tasks/topojson/world_rectangle.geojson`;
+        const outputFilePath = `${outputDirGeojson}/${name}_${resolution}m/ocean.geojson`;
+        const eraseFilePath = `${outputDirGeojson}/${source.ocean}.geojson`;
+        const commands = `${inputFilePath} ${bounds.length ? `-clip bbox=${bounds.join(',')}` : ''} -erase ${eraseFilePath} -o ${outputFilePath}`;
+        await mapshaper.runCommands(commands);
+    }
+}
+
+async function createWaterbodiesLayer({ bounds, name, source }) {
+    // Clip the waterbodies shapefile to each continent
+    console.log(`Building waterbodies layer for '${name}'`);
+    for (const resolution of resolutions) {
+        const inputFilePath = `${outputDirGeojson}/${source.waterbodies}.geojson`;
+        const outputFilePath = `${outputDirGeojson}/${name}_${resolution}m/waterbodies.geojson`;
+        const commands = `${inputFilePath} ${bounds.length ? `-clip bbox=${bounds.join(',')}` : ''} -o ${outputFilePath}`;
+        await mapshaper.runCommands(commands);
+    }
+}
+
+async function combineFiles() {
+    for (const resolution of resolutions) {
+        for (const { name } of scopes) {
+            const regionDir = path.join(outputDirGeojson, `${name}_${resolution}m`);
+            if (!fs.existsSync(regionDir)) {
+                console.log(`Couldn't find ${regionDir}`);
+                continue;
+            }
+
+            const outputFile = `${outputDirTopojson}/${name}_${resolution}m.json`;
+            // Layer names default to file names
+            const commands = `-i ${regionDir}/*.geojson combine-files -o format=topojson ${outputFile}`;
+            await mapshaper.runCommands(commands);
+
+            console.log(`Topojson saved to: ${outputFile}`);
+        }
+    }
+}
+
+for (const shapefile of shapefiles) {
+    await convertShpToGeo(shapefile);
+}
+for (const {
+    name,
+    specs: { acceptedFeatures, bounds, excludedFeatures = [], source }
+} of scopes) {
+    await createCountriesLayer({ acceptedFeatures, excludedFeatures, name, source });
+    await createLandLayer({ name, source });
+    await createCoastlinesLayer({ bounds, name, source });
+    await createOceanLayer({ bounds, name, source });
+    await createWaterbodiesLayer({ bounds, name, source });
+}
+
+await combineFiles();
diff --git a/tasks/topojson/world_rectangle.geojson b/tasks/topojson/world_rectangle.geojson
new file mode 100644
index 00000000000..efb6119b4b5
--- /dev/null
+++ b/tasks/topojson/world_rectangle.geojson
@@ -0,0 +1,21 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [-180, -90],
+            [180, -90],
+            [180, 90],
+            [-180, 90],
+            [-180,-90]
+          ]
+        ]
+      }
+    }
+  ]
+}
diff --git a/tasks/util/constants.js b/tasks/util/constants.js
index 6442501d9aa..1f6bb0a4856 100644
--- a/tasks/util/constants.js
+++ b/tasks/util/constants.js
@@ -24,20 +24,7 @@ var strictIndex = fs.readFileSync(pathToPlotlyStrict, 'utf-8');
 var allTraces = fs.readdirSync(path.join(pathToSrc, 'traces'))
     .filter(startsWithLowerCase);
 
-var pathToTopojsonSrc;
-try {
-    pathToTopojsonSrc = path.join(path.dirname(require.resolve('sane-topojson')), 'dist/');
-} catch(e) {
-    console.log([
-        '',
-        'WARN: Cannot resolve path to *sane-topojson* package.',
-        '  This can happen when one `npm link sane-topojson`',
-        '  and runs a command in a Docker container.',
-        '  There is nothing to worry, if you see this warning while running',
-        '  `npm run test-image`, `npm run test-export` or `npm run baseline` ;)',
-        ''
-    ].join('\n'));
-}
+var pathToTopojsonSrc = path.join(pathToDist, 'topojson/');
 
 var partialBundleNames = [
     'basic', 'cartesian', 'geo', 'gl3d', 'gl2d', 'mapbox', 'finance', 'strict'
diff --git a/test/jasmine/karma.conf.js b/test/jasmine/karma.conf.js
index eb350abccfe..9b2f6598051 100644
--- a/test/jasmine/karma.conf.js
+++ b/test/jasmine/karma.conf.js
@@ -118,7 +118,7 @@ if(isFullSuite) {
 }
 
 var pathToCustomMatchers = path.join(__dirname, 'assets', 'custom_matchers.js');
-var pathToSaneTopojsonDist = path.join(__dirname, '..', '..', 'node_modules', 'sane-topojson', 'dist');
+var pathToTopojsonDist = path.join(__dirname, '..', '..', 'dist', 'topojson');
 var pathToMathJax2 = path.join(__dirname, '..', '..', 'node_modules', 'mathjax-v2');
 var pathToMathJax3 = path.join(__dirname, '..', '..', 'node_modules', 'mathjax-v3');
 var pathToVirtualWebgl = path.join(__dirname, '..', '..', 'node_modules', 'virtual-webgl', 'src', 'virtual-webgl.js');
@@ -193,7 +193,7 @@ func.defaultConfig = {
         {pattern: pathToMathJax2 + '/**', included: false, watched: false, served: true},
         {pattern: pathToMathJax3 + '/**', included: false, watched: false, served: true},
         // available to fetch from /base/node_modules/sane-topojson/dist/
-        {pattern: pathToSaneTopojsonDist + '/**', included: false, watched: false, served: true}
+        {pattern: pathToTopojsonDist + '/**', included: false, watched: false, served: true}
     ],
 
     // list of files / pattern to exclude
diff --git a/test/jasmine/tests/geo_test.js b/test/jasmine/tests/geo_test.js
index 16ff8e10138..66ee8a65324 100644
--- a/test/jasmine/tests/geo_test.js
+++ b/test/jasmine/tests/geo_test.js
@@ -23,9 +23,7 @@ var DBLCLICKDELAY = require('../../../src/plot_api/plot_config').dfltConfig.doub
 var HOVERMINTIME = require('../../../src/components/fx').constants.HOVERMINTIME;
 
 // use local topojson files
-Plotly.setPlotConfig({
-    topojsonURL: '/base/node_modules/sane-topojson/dist/'
-});
+Plotly.setPlotConfig({ topojsonURL: '../../../dist/topojson' });
 
 function move(fromX, fromY, toX, toY, delay) {
     return new Promise(function(resolve) {