diff --git a/eslint.config.mjs b/eslint.config.mjs
index 91012a564f..f04c319949 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -71,17 +71,5 @@ export default tsEslint.config(
       },
     },
   },
-  {
-    files: [
-      "packages/turf-isobands/lib/marchingsquares-isobands.js",
-      "packages/turf-isolines/lib/marchingsquares-isocontours.js",
-    ],
-
-    languageOptions: {
-      globals: {
-        ...globals.browser,
-      },
-    },
-  },
   prettierRecommended
 );
diff --git a/packages/turf-isobands/package.json b/packages/turf-isobands/package.json
index e5387b9a4c..6cc27da302 100644
--- a/packages/turf-isobands/package.json
+++ b/packages/turf-isobands/package.json
@@ -4,7 +4,8 @@
   "description": "Takes a grid of values (GeoJSON format) and a set of threshold ranges. It outputs polygons that group areas within those ranges, effectively creating filled contour isobands.",
   "author": "Turf Authors",
   "contributors": [
-    "Stefano Borghi <@stebogit>"
+    "Stefano Borghi <@stebogit>",
+    "Matt Fedderly <@mfedderly>"
   ],
   "license": "MIT",
   "bugs": {
diff --git a/packages/turf-isolines/index.ts b/packages/turf-isolines/index.ts
index 2bf41aaa5c..105ba99900 100644
--- a/packages/turf-isolines/index.ts
+++ b/packages/turf-isolines/index.ts
@@ -2,8 +2,6 @@ import { bbox } from "@turf/bbox";
 import { coordEach } from "@turf/meta";
 import { collectionOf } from "@turf/invariant";
 import { multiLineString, featureCollection, isObject } from "@turf/helpers";
-// @ts-expect-error Legacy JS library with no types defined
-import { isoContours } from "marchingsquares";
 import { gridToMatrix } from "./lib/grid-to-matrix.js";
 import {
   FeatureCollection,
@@ -11,6 +9,7 @@ import {
   MultiLineString,
   Feature,
   GeoJsonProperties,
+  Position,
 } from "geojson";
 
 /**
@@ -70,6 +69,10 @@ function isolines(
   // Isoline methods
   const matrix = gridToMatrix(pointGrid, { zProperty: zProperty, flip: true });
 
+  // A quick note on what 'top' and 'bottom' mean in coordinate system of `matrix`:
+  // Remember that the southern hemisphere is represented by negative numbers,
+  // so a matrix Y of 0 is actually the *bottom*, and a Y of dy - 1 is the *top*.
+
   // check that the resulting matrix has consistent x and y dimensions and
   // has at least a 2x2 size so that we can actually build grid squares
   const dx = matrix[0].length;
@@ -122,18 +125,226 @@ function createIsoLines(
 
     const properties = { ...commonProperties, ...breaksProperties[i] };
     properties[zProperty] = threshold;
-    // Pass options to marchingsquares lib to reproduce historical turf
-    // behaviour.
-    const isoline = multiLineString(
-      isoContours(matrix, threshold, { linearRing: false, noFrame: true }),
-      properties
-    );
+    const isoline = multiLineString(isoContours(matrix, threshold), properties);
 
     results.push(isoline);
   }
   return results;
 }
 
+function isoContours(
+  matrix: ReadonlyArray<ReadonlyArray<number>>,
+  threshold: number
+): Position[][] {
+  // see https://en.wikipedia.org/wiki/Marching_squares
+  const segments: [Position, Position][] = [];
+
+  const dy = matrix.length;
+  const dx = matrix[0].length;
+
+  for (let y = 0; y < dy - 1; y++) {
+    for (let x = 0; x < dx - 1; x++) {
+      const tr = matrix[y + 1][x + 1];
+      const br = matrix[y][x + 1];
+      const bl = matrix[y][x];
+      const tl = matrix[y + 1][x];
+
+      let grid =
+        (tl >= threshold ? 8 : 0) |
+        (tr >= threshold ? 4 : 0) |
+        (br >= threshold ? 2 : 0) |
+        (bl >= threshold ? 1 : 0);
+
+      switch (grid) {
+        case 0:
+          continue;
+        case 1:
+          segments.push([
+            [x + frac(bl, br), y],
+            [x, y + frac(bl, tl)],
+          ]);
+          break;
+        case 2:
+          segments.push([
+            [x + 1, y + frac(br, tr)],
+            [x + frac(bl, br), y],
+          ]);
+          break;
+        case 3:
+          segments.push([
+            [x + 1, y + frac(br, tr)],
+            [x, y + frac(bl, tl)],
+          ]);
+          break;
+        case 4:
+          segments.push([
+            [x + frac(tl, tr), y + 1],
+            [x + 1, y + frac(br, tr)],
+          ]);
+          break;
+        case 5: {
+          // use the average of the 4 corners to differentiate the saddle case and correctly honor the counter-clockwise winding
+          const avg = (tl + tr + br + bl) / 4;
+          const above = avg >= threshold;
+
+          if (above) {
+            segments.push(
+              [
+                [x + frac(tl, tr), y + 1],
+                [x, y + frac(bl, tl)],
+              ],
+              [
+                [x + frac(bl, br), y],
+                [x + 1, y + frac(br, tr)],
+              ]
+            );
+          } else {
+            segments.push(
+              [
+                [x + frac(tl, tr), y + 1],
+                [x + 1, y + frac(br, tr)],
+              ],
+              [
+                [x + frac(bl, br), y],
+                [x, y + frac(bl, tl)],
+              ]
+            );
+          }
+          break;
+        }
+        case 6:
+          segments.push([
+            [x + frac(tl, tr), y + 1],
+            [x + frac(bl, br), y],
+          ]);
+          break;
+        case 7:
+          segments.push([
+            [x + frac(tl, tr), y + 1],
+            [x, y + frac(bl, tl)],
+          ]);
+          break;
+        case 8:
+          segments.push([
+            [x, y + frac(bl, tl)],
+            [x + frac(tl, tr), y + 1],
+          ]);
+          break;
+        case 9:
+          segments.push([
+            [x + frac(bl, br), y],
+            [x + frac(tl, tr), y + 1],
+          ]);
+          break;
+        case 10: {
+          const avg = (tl + tr + br + bl) / 4;
+          const above = avg >= threshold;
+
+          if (above) {
+            segments.push(
+              [
+                [x, y + frac(bl, tl)],
+                [x + frac(bl, br), y],
+              ],
+              [
+                [x + 1, y + frac(br, tr)],
+                [x + frac(tl, tr), y + 1],
+              ]
+            );
+          } else {
+            segments.push(
+              [
+                [x, y + frac(bl, tl)],
+                [x + frac(tl, tr), y + 1],
+              ],
+              [
+                [x + 1, y + frac(br, tr)],
+                [x + frac(bl, br), y],
+              ]
+            );
+          }
+          break;
+        }
+        case 11:
+          segments.push([
+            [x + 1, y + frac(br, tr)],
+            [x + frac(tl, tr), y + 1],
+          ]);
+          break;
+        case 12:
+          segments.push([
+            [x, y + frac(bl, tl)],
+            [x + 1, y + frac(br, tr)],
+          ]);
+          break;
+        case 13:
+          segments.push([
+            [x + frac(bl, br), y],
+            [x + 1, y + frac(br, tr)],
+          ]);
+          break;
+        case 14:
+          segments.push([
+            [x, y + frac(bl, tl)],
+            [x + frac(bl, br), y],
+          ]);
+          break;
+        case 15:
+          // all above
+          continue;
+      }
+    }
+  }
+
+  const contours: Position[][] = [];
+
+  while (segments.length > 0) {
+    const contour: Position[] = [...segments.shift()!];
+    contours.push(contour);
+
+    let found: boolean;
+    do {
+      found = false;
+      for (let i = 0; i < segments.length; i++) {
+        const segment = segments[i];
+        // add the segment's end point to the end of the contour
+        if (
+          segment[0][0] === contour[contour.length - 1][0] &&
+          segment[0][1] === contour[contour.length - 1][1]
+        ) {
+          found = true;
+          contour.push(segment[1]);
+          segments.splice(i, 1);
+          break;
+        }
+        // add the segment's start point to the start of the contour
+        if (
+          segment[1][0] === contour[0][0] &&
+          segment[1][1] === contour[0][1]
+        ) {
+          found = true;
+          contour.unshift(segment[0]);
+          segments.splice(i, 1);
+          break;
+        }
+      }
+    } while (found);
+  }
+
+  return contours;
+
+  // get the linear interpolation fraction of how far z is between z0 and z1
+  // See https://github.com/fschutt/marching-squares/blob/master/src/lib.rs
+  function frac(z0: number, z1: number): number {
+    if (z0 === z1) {
+      return 0.5;
+    }
+
+    let t = (threshold - z0) / (z1 - z0);
+    return t > 1 ? 1 : t < 0 ? 0 : t;
+  }
+}
+
 /**
  * Translates and scales isolines
  *
diff --git a/packages/turf-isolines/package.json b/packages/turf-isolines/package.json
index 60920c2c8c..5cd6d354df 100644
--- a/packages/turf-isolines/package.json
+++ b/packages/turf-isolines/package.json
@@ -4,7 +4,8 @@
   "description": "Generate contour lines from a grid of data.",
   "author": "Turf Authors",
   "contributors": [
-    "Stefano Borghi <@stebogit>"
+    "Stefano Borghi <@stebogit>",
+    "Matt Fedderly <@mfedderly>"
   ],
   "license": "MIT",
   "bugs": {
@@ -79,7 +80,6 @@
     "@turf/invariant": "workspace:*",
     "@turf/meta": "workspace:*",
     "@types/geojson": "^7946.0.10",
-    "marchingsquares": "^1.3.3",
     "tslib": "^2.8.1"
   }
 }
diff --git a/packages/turf-isolines/test/out/bigMatrix.geojson b/packages/turf-isolines/test/out/bigMatrix.geojson
index 529690781b..d02cc96932 100644
--- a/packages/turf-isolines/test/out/bigMatrix.geojson
+++ b/packages/turf-isolines/test/out/bigMatrix.geojson
@@ -14,47 +14,119 @@
         "type": "MultiLineString",
         "coordinates": [
           [
-            [6.638495, 49.179071],
-            [6.5, 49.161809]
+            [13.333575, 46.719456],
+            [13.424768, 46.665438],
+            [13.467696, 46.629524],
+            [13.52061, 46.539592],
+            [13.551757, 46.44966],
+            [13.563264, 46.386354],
+            [13.567553, 46.359728],
+            [13.564023, 46.269796],
+            [13.563264, 46.267861],
+            [13.527199, 46.179864],
+            [13.426546, 46.089932],
+            [13.424768, 46.088913],
+            [13.286273, 46.043257],
+            [13.147778, 46.040078],
+            [13.009282, 46.076361],
+            [12.98133, 46.089932],
+            [12.870787, 46.176678],
+            [12.867497, 46.179864],
+            [12.815364, 46.269796],
+            [12.792558, 46.359728],
+            [12.794113, 46.44966],
+            [12.817878, 46.539592],
+            [12.870787, 46.625291],
+            [12.873239, 46.629524],
+            [13.003638, 46.719456],
+            [13.009282, 46.72173],
+            [13.147778, 46.750639],
+            [13.286273, 46.736988],
+            [13.333575, 46.719456]
           ],
           [
-            [6.5, 49.444426],
-            [6.596926, 49.507349]
+            [14.586932, 46],
+            [14.671227, 46.0847],
+            [14.684441, 46.089932],
+            [14.809722, 46.118811],
+            [14.948217, 46.095223],
+            [14.9629, 46.089932],
+            [15.073333, 46]
           ],
           [
-            [6.776991, 49.222896],
-            [6.638495, 49.179071]
+            [15.248809, 46],
+            [15.363703, 46.074808],
+            [15.404796, 46.089932],
+            [15.502199, 46.131327],
+            [15.5712, 46.179864],
+            [15.640694, 46.214118],
+            [15.77919, 46.265899],
+            [15.917685, 46.245906],
+            [16.004625, 46.179864],
+            [16.019208, 46.089932],
+            [15.989697, 46]
           ],
           [
-            [6.805692, 49.237553],
-            [6.776991, 49.222896]
+            [19.261103, 46.269796],
+            [19.241574, 46.261638],
+            [19.227967, 46.269796],
+            [19.241574, 46.28155],
+            [19.261103, 46.269796]
           ],
           [
-            [6.915486, 49.311577],
-            [6.805692, 49.237553]
+            [17.483942, 46.539592],
+            [17.441134, 46.509911],
+            [17.398412, 46.539592],
+            [17.441134, 46.565069],
+            [17.483942, 46.539592]
           ],
           [
-            [6.932951, 49.327485],
-            [6.915486, 49.311577]
+            [18.274679, 46.539592],
+            [18.272106, 46.539023],
+            [18.271836, 46.539592],
+            [18.272106, 46.540117],
+            [18.274679, 46.539592]
           ],
           [
-            [6.994818, 49.417417],
-            [6.932951, 49.327485]
+            [16.983186, 46.629524],
+            [16.887153, 46.616213],
+            [16.866868, 46.629524],
+            [16.887153, 46.686717],
+            [16.983186, 46.629524]
           ],
           [
-            [7.017371, 49.507349],
-            [6.994818, 49.417417]
+            [12.496746, 47.079184],
+            [12.532649, 46.989252],
+            [12.464469, 46.89932],
+            [12.455301, 46.893482],
+            [12.316805, 46.859784],
+            [12.17831, 46.898495],
+            [12.177161, 46.89932],
+            [12.112964, 46.989252],
+            [12.154879, 47.079184],
+            [12.17831, 47.097102],
+            [12.316805, 47.14904],
+            [12.455301, 47.13561],
+            [12.496746, 47.079184]
+          ],
+          [
+            [15.664979, 47.259049],
+            [15.77919, 47.222509],
+            [15.834548, 47.169116],
+            [15.789098, 47.079184],
+            [15.77919, 47.072803],
+            [15.640694, 47.070845],
+            [15.606895, 47.079184],
+            [15.502199, 47.115385],
+            [15.363703, 47.167282],
+            [15.361223, 47.169116],
+            [15.336906, 47.259049],
+            [15.363703, 47.279081],
+            [15.502199, 47.319692],
+            [15.640694, 47.267231],
+            [15.664979, 47.259049]
           ],
           [
-            [7.469468, 47.539233],
-            [7.398672, 47.618777],
-            [7.369353, 47.708709],
-            [7.392465, 47.798641],
-            [7.469468, 47.873837],
-            [7.49141, 47.888573],
-            [7.607963, 47.931492],
-            [7.746458, 47.938693],
-            [7.884954, 47.89919],
             [7.899188, 47.888573],
             [8.000611, 47.798641],
             [8.023449, 47.751713],
@@ -78,18 +150,38 @@
             [7.607963, 47.432938],
             [7.602787, 47.438913],
             [7.483616, 47.528845],
-            [7.469468, 47.539233]
+            [7.469468, 47.539233],
+            [7.398672, 47.618777],
+            [7.369353, 47.708709],
+            [7.392465, 47.798641],
+            [7.469468, 47.873837],
+            [7.49141, 47.888573],
+            [7.607963, 47.931492],
+            [7.746458, 47.938693],
+            [7.884954, 47.89919],
+            [7.899188, 47.888573]
+          ],
+          [
+            [12.559982, 47.348981],
+            [12.579726, 47.259049],
+            [12.455301, 47.183226],
+            [12.329096, 47.259049],
+            [12.352189, 47.348981],
+            [12.455301, 47.385966],
+            [12.559982, 47.348981]
+          ],
+          [
+            [14.897997, 47.348981],
+            [14.890392, 47.259049],
+            [14.809722, 47.2071],
+            [14.671227, 47.203042],
+            [14.575353, 47.259049],
+            [14.565439, 47.348981],
+            [14.671227, 47.417355],
+            [14.809722, 47.411845],
+            [14.897997, 47.348981]
           ],
           [
-            [8.854421, 47.393577],
-            [8.767107, 47.438913],
-            [8.738554, 47.528845],
-            [8.774536, 47.618777],
-            [8.779112, 47.708709],
-            [8.805405, 47.798641],
-            [8.854421, 47.854382],
-            [8.942356, 47.888573],
-            [8.992917, 47.908661],
             [9.101873, 47.888573],
             [9.131412, 47.87878],
             [9.212607, 47.798641],
@@ -99,207 +191,198 @@
             [9.17041, 47.438913],
             [9.131412, 47.412762],
             [8.992917, 47.372654],
-            [8.854421, 47.393577]
-          ],
-          [
-            [12.17831, 46.898495],
-            [12.177161, 46.89932],
-            [12.112964, 46.989252],
-            [12.154879, 47.079184],
-            [12.17831, 47.097102],
-            [12.316805, 47.14904],
-            [12.455301, 47.13561],
-            [12.496746, 47.079184],
-            [12.532649, 46.989252],
-            [12.464469, 46.89932],
-            [12.455301, 46.893482],
-            [12.316805, 46.859784],
-            [12.17831, 46.898495]
+            [8.854421, 47.393577],
+            [8.767107, 47.438913],
+            [8.738554, 47.528845],
+            [8.774536, 47.618777],
+            [8.779112, 47.708709],
+            [8.805405, 47.798641],
+            [8.854421, 47.854382],
+            [8.942356, 47.888573],
+            [8.992917, 47.908661],
+            [9.101873, 47.888573]
           ],
           [
+            [12.360972, 47.528845],
             [12.316805, 47.48062],
             [12.274592, 47.528845],
             [12.316805, 47.539311],
-            [12.360972, 47.528845],
-            [12.316805, 47.48062]
+            [12.360972, 47.528845]
           ],
           [
-            [12.455301, 47.183226],
-            [12.329096, 47.259049],
-            [12.352189, 47.348981],
-            [12.455301, 47.385966],
-            [12.559982, 47.348981],
-            [12.579726, 47.259049],
-            [12.455301, 47.183226]
+            [16.668716, 47.618777],
+            [16.610162, 47.604288],
+            [16.590133, 47.618777],
+            [16.610162, 47.644458],
+            [16.668716, 47.618777]
           ],
           [
+            [12.765117, 48.158369],
+            [12.842427, 48.068437],
             [12.732292, 48.019172],
             [12.607371, 48.068437],
             [12.69843, 48.158369],
             [12.732292, 48.169413],
-            [12.765117, 48.158369],
-            [12.842427, 48.068437],
-            [12.732292, 48.019172]
-          ],
-          [
-            [12.870787, 46.176678],
-            [12.867497, 46.179864],
-            [12.815364, 46.269796],
-            [12.792558, 46.359728],
-            [12.794113, 46.44966],
-            [12.817878, 46.539592],
-            [12.870787, 46.625291],
-            [12.873239, 46.629524],
-            [13.003638, 46.719456],
-            [13.009282, 46.72173],
-            [13.147778, 46.750639],
-            [13.286273, 46.736988],
-            [13.333575, 46.719456],
-            [13.424768, 46.665438],
-            [13.467696, 46.629524],
-            [13.52061, 46.539592],
-            [13.551757, 46.44966],
-            [13.563264, 46.386354],
-            [13.567553, 46.359728],
-            [13.564023, 46.269796],
-            [13.563264, 46.267861],
-            [13.527199, 46.179864],
-            [13.426546, 46.089932],
-            [13.424768, 46.088913],
-            [13.286273, 46.043257],
-            [13.147778, 46.040078],
-            [13.009282, 46.076361],
-            [12.98133, 46.089932],
-            [12.870787, 46.176678]
+            [12.765117, 48.158369]
           ],
           [
-            [14.586932, 46],
-            [14.671227, 46.0847],
-            [14.684441, 46.089932],
-            [14.809722, 46.118811],
-            [14.948217, 46.095223],
-            [14.9629, 46.089932],
-            [15.073333, 46]
+            [7.017371, 49.507349],
+            [6.994818, 49.417417],
+            [6.932951, 49.327485],
+            [6.915486, 49.311577],
+            [6.805692, 49.237553],
+            [6.776991, 49.222896],
+            [6.638495, 49.179071],
+            [6.5, 49.161809]
           ],
           [
-            [14.671227, 47.203042],
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@@ -910,39 +760,6 @@
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@@ -971,62 +821,6 @@
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@@ -1166,7 +1010,10 @@
         "fill": "red",
         "pressure": 100
       },
-      "geometry": { "type": "MultiLineString", "coordinates": [] }
+      "geometry": {
+        "type": "MultiLineString",
+        "coordinates": []
+      }
     },
     {
       "type": "Feature",
diff --git a/packages/turf-isolines/test/out/matrix1.geojson b/packages/turf-isolines/test/out/matrix1.geojson
index b67dfba6ac..8ff652ed6e 100644
--- a/packages/turf-isolines/test/out/matrix1.geojson
+++ b/packages/turf-isolines/test/out/matrix1.geojson
@@ -3,11 +3,21 @@
   "features": [
     {
       "type": "Feature",
-      "properties": { "temperature": 2 },
+      "properties": {
+        "temperature": 2
+      },
       "geometry": {
         "type": "MultiLineString",
         "coordinates": [
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@@ -18,26 +28,28 @@
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+            [12.071816, 44.954354]
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     {
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+      "properties": {
+        "temperature": 4
+      },
       "geometry": {
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         "coordinates": [
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@@ -48,57 +60,53 @@
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+      },
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     {
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+      "properties": {
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+      },
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diff --git a/packages/turf-isolines/test/out/matrix2.geojson b/packages/turf-isolines/test/out/matrix2.geojson
index 6e09eb3644..ee6c9e0b03 100644
--- a/packages/turf-isolines/test/out/matrix2.geojson
+++ b/packages/turf-isolines/test/out/matrix2.geojson
@@ -14,14 +14,6 @@
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@@ -38,14 +30,22 @@
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             [11.793788, 44.719456],
-            [11.619012, 44.842091],
-            [11.444237, 44.719456]
+            [11.619012, 44.842091]
           ]
         ]
       }
@@ -63,6 +63,17 @@
         "type": "MultiLineString",
         "coordinates": [
           [
+            [12.182954, 45.259049],
+            [12.336757, 45.079184],
+            [12.336757, 44.89932],
+            [12.388024, 44.719456],
+            [12.336757, 44.539592],
+            [12.336757, 44.359728],
+            [12.182954, 44.179864],
+            [12.131687, 44.143891],
+            [11.87535, 44.035973],
+            [11.619012, 44],
+            [11.362675, 44.035973],
             [11.106337, 44.143891],
             [11.05507, 44.179864],
             [10.901267, 44.359728],
@@ -76,25 +87,14 @@
             [11.619012, 45.438913],
             [11.87535, 45.40294],
             [12.131687, 45.295021],
-            [12.182954, 45.259049],
-            [12.336757, 45.079184],
-            [12.336757, 44.89932],
-            [12.388024, 44.719456],
-            [12.336757, 44.539592],
-            [12.336757, 44.359728],
-            [12.182954, 44.179864],
-            [12.131687, 44.143891],
-            [11.87535, 44.035973],
-            [11.619012, 44],
-            [11.362675, 44.035973],
-            [11.106337, 44.143891]
+            [12.182954, 45.259049]
           ],
           [
+            [11.619012, 44.76851],
             [11.549102, 44.719456],
             [11.619012, 44.670402],
             [11.688922, 44.719456],
-            [11.619012, 44.76851],
-            [11.549102, 44.719456]
+            [11.619012, 44.76851]
           ]
         ]
       }
@@ -115,14 +115,14 @@
             [11.080704, 44],
             [10.85, 44.161878]
           ],
-          [
-            [10.85, 45.277035],
-            [11.080704, 45.438913]
-          ],
           [
             [12.388024, 44.161878],
             [12.157321, 44]
           ],
+          [
+            [10.85, 45.277035],
+            [11.080704, 45.438913]
+          ],
           [
             [12.157321, 45.438913],
             [12.388024, 45.277035]
@@ -146,14 +146,14 @@
             [10.85, 44],
             [10.85, 44]
           ],
-          [
-            [10.85, 45.438913],
-            [10.85, 45.438913]
-          ],
           [
             [12.388024, 44],
             [12.388024, 44]
           ],
+          [
+            [10.85, 45.438913],
+            [10.85, 45.438913]
+          ],
           [
             [12.388024, 45.438913],
             [12.388024, 45.438913]
diff --git a/packages/turf-isolines/test/out/pointGrid.geojson b/packages/turf-isolines/test/out/pointGrid.geojson
index 24faca3dcd..34f70dd92c 100644
--- a/packages/turf-isolines/test/out/pointGrid.geojson
+++ b/packages/turf-isolines/test/out/pointGrid.geojson
@@ -3,7 +3,10 @@
   "features": [
     {
       "type": "Feature",
-      "properties": { "fill-opacity": 0.5, "population": 20 },
+      "properties": {
+        "fill-opacity": 0.5,
+        "population": 20
+      },
       "geometry": {
         "type": "MultiLineString",
         "coordinates": [
@@ -25,8 +28,9 @@
             [-70.645198, -33.553984]
           ],
           [
-            [-70.769424, -33.443779],
-            [-70.823364, -33.429795]
+            [-70.671006, -33.553984],
+            [-70.715483, -33.518772],
+            [-70.764237, -33.553984]
           ],
           [
             [-70.823364, -33.406542],
@@ -34,36 +38,26 @@
             [-70.769424, -33.351019],
             [-70.742454, -33.374176],
             [-70.731216, -33.419128],
-            [-70.769424, -33.443779]
-          ],
-          [
-            [-70.715483, -33.518772],
-            [-70.764237, -33.553984]
-          ],
-          [
-            [-70.671006, -33.553984],
-            [-70.715483, -33.518772]
-          ],
-          [
-            [-70.607603, -33.337216],
-            [-70.629732, -33.329224]
-          ],
-          [
-            [-70.553662, -33.335329],
-            [-70.607603, -33.337216]
+            [-70.769424, -33.443779],
+            [-70.823364, -33.429795]
           ],
           [
             [-70.499722, -33.442285],
             [-70.514512, -33.419128],
             [-70.511237, -33.374176],
-            [-70.553662, -33.335329]
+            [-70.553662, -33.335329],
+            [-70.607603, -33.337216],
+            [-70.629732, -33.329224]
           ]
         ]
       }
     },
     {
       "type": "Feature",
-      "properties": { "fill-opacity": 0.6, "population": 40 },
+      "properties": {
+        "fill-opacity": 0.6,
+        "population": 40
+      },
       "geometry": {
         "type": "MultiLineString",
         "coordinates": [
@@ -74,14 +68,21 @@
             [-70.823364, -33.445033]
           ],
           [
-            [-70.823364, -33.388561],
-            [-70.80708, -33.374176],
-            [-70.771237, -33.329224]
-          ],
-          [
+            [-70.689933, -33.553984],
             [-70.715483, -33.533756],
             [-70.743491, -33.553984]
           ],
+          [
+            [-70.499722, -33.468361],
+            [-70.527801, -33.509032],
+            [-70.553662, -33.539288],
+            [-70.607603, -33.54859],
+            [-70.612506, -33.553984]
+          ],
+          [
+            [-70.515455, -33.553984],
+            [-70.499722, -33.546991]
+          ],
           [
             [-70.764287, -33.329224],
             [-70.715483, -33.370887],
@@ -99,43 +100,26 @@
             [-70.657394, -33.329224]
           ],
           [
-            [-70.689933, -33.553984],
-            [-70.715483, -33.533756]
-          ],
-          [
-            [-70.607603, -33.54859],
-            [-70.612506, -33.553984]
-          ],
-          [
-            [-70.553662, -33.539288],
-            [-70.607603, -33.54859]
-          ],
-          [
-            [-70.515455, -33.553984],
-            [-70.499722, -33.546991]
-          ],
-          [
-            [-70.527801, -33.509032],
-            [-70.553662, -33.539288]
-          ],
-          [
-            [-70.499722, -33.468361],
-            [-70.527801, -33.509032]
+            [-70.823364, -33.388561],
+            [-70.80708, -33.374176],
+            [-70.771237, -33.329224]
           ]
         ]
       }
     },
     {
       "type": "Feature",
-      "properties": { "fill-opacity": 0.7, "population": 80 },
+      "properties": {
+        "fill-opacity": 0.7,
+        "population": 80
+      },
       "geometry": {
         "type": "MultiLineString",
         "coordinates": [
           [
-            [-70.823364, -33.363279],
-            [-70.789368, -33.329224]
-          ],
-          [
+            [-70.553662, -33.368626],
+            [-70.607603, -33.367184],
+            [-70.661543, -33.369791],
             [-70.666134, -33.374176],
             [-70.661543, -33.379976],
             [-70.626021, -33.419128],
@@ -143,18 +127,25 @@
             [-70.581563, -33.419128],
             [-70.553662, -33.392157],
             [-70.547602, -33.374176],
-            [-70.553662, -33.368626],
-            [-70.607603, -33.367184],
-            [-70.661543, -33.369791],
-            [-70.666134, -33.374176]
+            [-70.553662, -33.368626]
+          ],
+          [
+            [-70.823364, -33.363279],
+            [-70.789368, -33.329224]
           ]
         ]
       }
     },
     {
       "type": "Feature",
-      "properties": { "fill-opacity": 0.8, "population": 160 },
-      "geometry": { "type": "MultiLineString", "coordinates": [] }
+      "properties": {
+        "fill-opacity": 0.8,
+        "population": 160
+      },
+      "geometry": {
+        "type": "MultiLineString",
+        "coordinates": []
+      }
     },
     {
       "type": "Feature",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e4d8df702c..1a4bd7a1ed 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -3576,9 +3576,6 @@ importers:
       '@types/geojson':
         specifier: ^7946.0.10
         version: 7946.0.14
-      marchingsquares:
-        specifier: ^1.3.3
-        version: 1.3.3
       tslib:
         specifier: ^2.8.1
         version: 2.8.1