diff --git a/src/main/java/com/mapconductor/googlemaps/polygon/GoogleMapPolygonOverlayRenderer.kt b/src/main/java/com/mapconductor/googlemaps/polygon/GoogleMapPolygonOverlayRenderer.kt
index d579143..c7bedf5 100644
--- a/src/main/java/com/mapconductor/googlemaps/polygon/GoogleMapPolygonOverlayRenderer.kt
+++ b/src/main/java/com/mapconductor/googlemaps/polygon/GoogleMapPolygonOverlayRenderer.kt
@@ -6,12 +6,11 @@ import com.google.android.gms.maps.model.PolygonOptions
 import com.mapconductor.core.ResourceProvider
 import com.mapconductor.core.features.GeoPoint
 import com.mapconductor.core.features.GeoPointInterface
+import com.mapconductor.core.geometry.densifyPolygonRing
 import com.mapconductor.core.polygon.AbstractPolygonOverlayRenderer
 import com.mapconductor.core.polygon.PolygonEntityInterface
 import com.mapconductor.core.polygon.PolygonState
 import com.mapconductor.core.polygon.unionHoles
-import com.mapconductor.core.spherical.Planar
-import com.mapconductor.core.spherical.WGS84Geodesic
 import com.mapconductor.googlemaps.AdaptiveInterpolation
 import com.mapconductor.googlemaps.GoogleMapActualPolygon
 import com.mapconductor.googlemaps.GoogleMapViewHolder
@@ -42,7 +41,9 @@ internal class GoogleMapPolygonOverlayRenderer(
         val key = AdaptiveInterpolation.cacheKey(AdaptiveInterpolation.pointsHash(statePoints), maxSegmentLength)
         interpolationCache.get(key)?.let { return it }
 
-        val geoPoints = WGS84Geodesic.createInterpolatePoints(statePoints, maxSegmentLength = maxSegmentLength)
+        // リングの閉じる辺（末尾 → 先頭）も大圏で補間する。隣り合う点の間だけを補間すると、閉じる辺が
+        // 直線の弦になり、塗りも輪郭（同じネイティブポリゴンの stroke）もそこだけ直線になる。
+        val geoPoints = densifyPolygonRing(statePoints, geodesic = true, maxSegmentLength = maxSegmentLength)
         val points = geoPoints.map { GeoPoint.from(it).toLatLng() }
         interpolationCache.put(key, points)
         return points
@@ -54,7 +55,9 @@ internal class GoogleMapPolygonOverlayRenderer(
     ): List<LatLng> =
         when (geodesic) {
             true -> geodesicPoints(statePoints)
-            false -> Planar.createInterpolatePoints(statePoints).map { GeoPoint.from(it).toLatLng() }
+            // geodesic=false も閉じる辺を緯度経度で線形補間する（輪郭のポリラインと同じ線。補間しないと
+            // 閉じる辺だけメルカトルの直線になる）。
+            false -> densifyPolygonRing(statePoints, geodesic = false).map { GeoPoint.from(it).toLatLng() }
         }
 
     private fun toLatLngHoles(