- Category: Water Feature
- Type: Island
- Latitude/Longitude: 54°32'8"N 0°44'45"W
- Eastings/Northings: 481236, 516327
- OS Grid: NZ812163
- Mapcode Local: GBR RH7Z.8V
- Mapcode Global: WHF8K.H8Y6
Location and coordinates are for the approximate centre of Cobble Dump within this administrative area.
Geographic features and populated places may cross administrative borders.