Index: source/gui/ObjectTypes/CMiniMap.cpp
===================================================================
--- source/gui/ObjectTypes/CMiniMap.cpp
+++ source/gui/ObjectTypes/CMiniMap.cpp
@@ -345,19 +345,20 @@
 //  which represents the view of the camera in the world.
 void CMiniMap::DrawViewRect(const CMatrix3D& transform) const
 {
-	// Compute the camera frustum intersected with a fixed-height plane.
-	// Use the water height as a fixed base height, which should be the lowest we can go
-	float h = g_Renderer.GetWaterManager()->m_WaterHeight;
+	// Compute the camera frustum intersected with an imaginary plane
+	// derived from the center-point of the camera's current view.
+
 	const float width = m_CachedActualSize.GetWidth();
 	const float height = m_CachedActualSize.GetHeight();
 	const float invTileMapSize = 1.0f / float(TERRAIN_TILE_SIZE * m_MapSize);
 
 	const CCamera* camera = g_Game->GetView()->GetCamera();
+	float planeHeight = camera->GetWorldCoordinates(g_Renderer.GetWidth() / 2, g_Renderer.GetHeight() / 2, true).Y;
 	const std::array<CVector3D, 4> hitPoints = {
-		camera->GetWorldCoordinates(0, g_Renderer.GetHeight(), h),
-		camera->GetWorldCoordinates(g_Renderer.GetWidth(), g_Renderer.GetHeight(), h),
-		camera->GetWorldCoordinates(g_Renderer.GetWidth(), 0, h),
-		camera->GetWorldCoordinates(0, 0, h)
+		camera->GetWorldCoordinates(0, g_Renderer.GetHeight(), planeHeight),
+		camera->GetWorldCoordinates(g_Renderer.GetWidth(), g_Renderer.GetHeight(), planeHeight),
+		camera->GetWorldCoordinates(g_Renderer.GetWidth(), 0, planeHeight),
+		camera->GetWorldCoordinates(0, 0, planeHeight)
 	};
 
 	std::vector<CVector3D> lines;