diff --git a/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.test.ts b/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.test.ts
index 50725fefe6f..a7b7be3ab9a 100644
--- a/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.test.ts
+++ b/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.test.ts
@@ -69,6 +69,37 @@ describe('Polygon transformProps', () => {
     emitCrossFilters: false,
   };
 
+  const mockedChartPropsWithGeoHash: Partial<ChartProps> = {
+    ...mockChartProps,
+    rawFormData: {
+      line_column: 'geohash',
+      line_type: 'geohash',
+      viewport: {},
+    },
+    queriesData: [
+      {
+        data: [
+          {
+            geohash: '9q8yt',
+            'sum(population)': 9800,
+          },
+          {
+            geohash: '9q8yk',
+            'sum(population)': 13100,
+          },
+          {
+            geohash: '9q8yv',
+            'sum(population)': 15600,
+          },
+          {
+            geohash: '9q8yq',
+            'sum(population)': 7500,
+          },
+        ],
+      },
+    ],
+  };
+
   test('should use constant elevation value when point_radius_fixed type is "fix"', () => {
     const fixProps = {
       ...mockChartProps,
@@ -257,4 +288,23 @@ describe('Polygon transformProps', () => {
     expect(features).toHaveLength(1);
     expect(features[0]?.elevation).toBeUndefined();
   });
+
+  test('should handle geohash decoding successfully', () => {
+    const props = {
+      ...mockedChartPropsWithGeoHash,
+      rawFormData: {
+        ...mockedChartPropsWithGeoHash.rawFormData,
+        point_radius_fixed: {
+          type: 'fix',
+          value: '1000',
+        },
+      },
+    };
+
+    const result = transformProps(props as ChartProps);
+
+    const features = result.payload.data.features as PolygonFeature[];
+    expect(features.flatMap(p => p?.polygon || [])).toHaveLength(20); // 4 geohashes x 5 corners each
+    expect(features[0]?.elevation).toBe(1000);
+  });
 });
diff --git a/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.ts b/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.ts
index 3c55142d39e..bb070d92e36 100644
--- a/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.ts
+++ b/superset-frontend/plugins/legacy-preset-chart-deckgl/src/layers/Polygon/transformProps.ts
@@ -26,6 +26,7 @@ import {
   addPropertiesToFeature,
 } from '../transformUtils';
 import { DeckPolygonFormData } from './buildQuery';
+import { decode_bbox } from 'ngeohash';
 
 function parseElevationValue(value: string): number | undefined {
   const parsed = parseFloat(value);
@@ -122,6 +123,16 @@ function processPolygonData(
             break;
           }
           case 'geohash':
+            polygonCoords = [];
+            const decoded = decode_bbox(String(rawPolygonData));
+            if (decoded) {
+              polygonCoords.push([decoded[1], decoded[0]]); // SW (minLon, minLat)
+              polygonCoords.push([decoded[1], decoded[2]]); // NW (minLon, maxLat)
+              polygonCoords.push([decoded[3], decoded[2]]); // NE (maxLon, maxLat)
+              polygonCoords.push([decoded[3], decoded[0]]); // SE (maxLon, minLat)
+              polygonCoords.push([decoded[1], decoded[0]]); // SW (close polygon)
+            }
+            break;
           case 'zipcode':
           default: {
             polygonCoords = Array.isArray(rawPolygonData) ? rawPolygonData : [];