diff --git a/frontend/__tests__/unit/components/ChapterMap.test.tsx b/frontend/__tests__/unit/components/ChapterMap.test.tsx
index d16027d496..bbdc01e5f5 100644
--- a/frontend/__tests__/unit/components/ChapterMap.test.tsx
+++ b/frontend/__tests__/unit/components/ChapterMap.test.tsx
@@ -1,4 +1,5 @@
 import { render } from '@testing-library/react'
+import * as L from 'leaflet'
 import { Chapter } from 'types/chapter'
 import ChapterMap from 'components/ChapterMap'
 
@@ -113,8 +114,6 @@ describe('ChapterMap', () => {
 
   describe('Map initialization', () => {
     it('initializes leaflet map with correct configuration', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
       render(<ChapterMap {...defaultProps} />)
       expect(L.map).toHaveBeenCalledWith('chapter-map', {
         worldCopyJump: false,
@@ -128,9 +127,6 @@ describe('ChapterMap', () => {
     })
 
     it('adds tile layer to the map', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
-
       render(<ChapterMap {...defaultProps} />)
       expect(L.tileLayer).toHaveBeenCalledWith(
         'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
@@ -143,9 +139,6 @@ describe('ChapterMap', () => {
     })
 
     it('creates and adds marker cluster group', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
-
       render(<ChapterMap {...defaultProps} />)
       expect(L.markerClusterGroup).toHaveBeenCalled()
       expect(mockMap.addLayer).toHaveBeenCalledWith(mockMarkerClusterGroup)
@@ -154,19 +147,45 @@ describe('ChapterMap', () => {
 
   describe('Markers', () => {
     it('creates markers for each chapter', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
-
       render(<ChapterMap {...defaultProps} />)
       expect(L.marker).toHaveBeenCalledTimes(2)
       expect(L.marker).toHaveBeenCalledWith([40.7128, -74.006], { icon: mockIcon })
       expect(L.marker).toHaveBeenCalledWith([51.5074, -0.1278], { icon: mockIcon })
     })
 
-    it('creates marker icons with correct configuration', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
+    it('filters out virtual chapters when latitude longitude undefined', () => {
+      const virtualChapterData: Chapter[] = [
+        mockChapterData[0],
+        {
+          // A virtual chapter with no location data
+          ...mockChapterData[1],
+          _geoloc: undefined,
+          geoLocation: undefined,
+        },
+      ]
+
+      render(<ChapterMap {...defaultProps} geoLocData={virtualChapterData} />)
+      expect(L.marker).toHaveBeenCalledTimes(1)
+      expect(L.marker).not.toHaveBeenCalledWith([undefined, undefined], { icon: mockIcon })
+    })
+
+    it('filters out virtual chapters when latitude longitude null', () => {
+      const virtualChapterData: Chapter[] = [
+        mockChapterData[0],
+        {
+          // A virtual chapter with no location data
+          ...mockChapterData[1],
+          _geoloc: null,
+          geoLocation: null,
+        },
+      ]
+
+      render(<ChapterMap {...defaultProps} geoLocData={virtualChapterData} />)
+      expect(L.marker).toHaveBeenCalledTimes(1)
+      expect(L.marker).not.toHaveBeenCalledWith([null, null], { icon: mockIcon })
+    })
 
+    it('creates marker icons with correct configuration', () => {
       render(<ChapterMap {...defaultProps} />)
       expect(L.Icon).toHaveBeenCalledWith({
         iconAnchor: [12, 41],
@@ -185,8 +204,6 @@ describe('ChapterMap', () => {
     })
 
     it('handles chapters with missing _geoloc but present geolocation', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
       const chapterWithoutGeoloc: Chapter[] = [
         {
           ...mockChapterData[0],
@@ -198,13 +215,24 @@ describe('ChapterMap', () => {
       render(<ChapterMap {...defaultProps} geoLocData={chapterWithoutGeoloc} />)
       expect(L.marker).toHaveBeenCalledWith([35.6762, 139.6503], { icon: mockIcon })
     })
+
+    it('handles chapters with 0 coordinates correctly', () => {
+      const chapterWithZeroCoords: Chapter[] = [
+        {
+          ...mockChapterData[0],
+          _geoloc: { lat: 0, lng: 0 },
+          geoLocation: { lat: 0, lng: 0 },
+        },
+      ]
+
+      render(<ChapterMap {...defaultProps} geoLocData={chapterWithZeroCoords} />)
+      expect(L.marker).toHaveBeenCalledTimes(1)
+      expect(L.marker).toHaveBeenCalledWith([0, 0], { icon: mockIcon })
+    })
   })
 
   describe('Popups', () => {
     it('creates popups for each marker', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
-
       render(<ChapterMap {...defaultProps} />)
       expect(L.popup).toHaveBeenCalledTimes(2)
       expect(mockMarker.bindPopup).toHaveBeenCalledTimes(2)
@@ -223,8 +251,6 @@ describe('ChapterMap', () => {
 
   describe('Local View', () => {
     it('sets local view when showLocal is true', () => {
-      // eslint-disable-next-line @typescript-eslint/no-require-imports
-      const L = require('leaflet')
       render(<ChapterMap {...defaultProps} showLocal={true} />)
 
       expect(mockMap.setView).toHaveBeenCalledWith([40.7128, -74.006], 7)
diff --git a/frontend/src/components/ChapterMap.tsx b/frontend/src/components/ChapterMap.tsx
index 36c360aca5..e753adadea 100644
--- a/frontend/src/components/ChapterMap.tsx
+++ b/frontend/src/components/ChapterMap.tsx
@@ -48,7 +48,13 @@ const ChapterMap = ({
 
     const markerClusterGroup = markerClusterRef.current
 
-    const markers = geoLocData.map((chapter) => {
+    const validGeoLocData = geoLocData.filter((chapter) => {
+      const lat = chapter._geoloc?.lat ?? chapter.geoLocation?.lat
+      const lng = chapter._geoloc?.lng ?? chapter.geoLocation?.lng
+      return typeof lat === 'number' && typeof lng === 'number'
+    })
+
+    const markers = validGeoLocData.map((chapter) => {
       const markerIcon = new L.Icon({
         iconAnchor: [12, 41],
         iconRetinaUrl: '/img/marker-icon-2x.png',
@@ -61,8 +67,8 @@ const ChapterMap = ({
 
       const marker = L.marker(
         [
-          chapter._geoloc?.lat || chapter.geoLocation?.lat,
-          chapter._geoloc?.lng || chapter.geoLocation?.lng,
+          chapter._geoloc?.lat ?? chapter.geoLocation?.lat,
+          chapter._geoloc?.lng ?? chapter.geoLocation?.lng,
         ],
         { icon: markerIcon }
       )
@@ -80,21 +86,21 @@ const ChapterMap = ({
 
     markerClusterGroup.addLayers(markers)
 
-    if (showLocal && geoLocData.length > 0) {
+    if (showLocal && validGeoLocData.length > 0) {
       const maxNearestChapters = 5
-      const localChapters = geoLocData.slice(0, maxNearestChapters - 1)
+      const localChapters = validGeoLocData.slice(0, maxNearestChapters - 1)
       const localBounds = L.latLngBounds(
         localChapters.map((chapter) => [
-          chapter._geoloc?.lat || chapter.geoLocation?.lat,
-          chapter._geoloc?.lng || chapter.geoLocation?.lng,
+          chapter._geoloc?.lat ?? chapter.geoLocation?.lat,
+          chapter._geoloc?.lng ?? chapter.geoLocation?.lng,
         ])
       )
       const maxZoom = 7
-      const nearestChapter = geoLocData[0]
+      const nearestChapter = validGeoLocData[0]
       map.setView(
         [
-          nearestChapter._geoloc?.lat || nearestChapter.geoLocation?.lat,
-          nearestChapter._geoloc?.lng || nearestChapter.geoLocation?.lng,
+          nearestChapter._geoloc?.lat ?? nearestChapter.geoLocation?.lat,
+          nearestChapter._geoloc?.lng ?? nearestChapter.geoLocation?.lng,
         ],
         maxZoom
       )