Zone boundary lines are intended to follow the centerline of streets, railroad rights-of-way, streams, and recorded property lines, except where indicated otherwise by dimension or other notation on the zoning map of the borough.

Where zone boundaries are not fixed by dimension or other notation and where they approximately follow property lines or other natural features and do not scale more than 25 feet distant therefrom, such property line or natural feature shall be deemed to be the location of the zone boundary.

In unsubdivided land, where a zone boundary divides a property and the location of such boundary is not fixed by dimensions or other notation on the zoning map, then the location of such boundary shall be determined by the board of adjustment through use of the graphic scale appearing on the map.