- Category: Water Feature
- Type: Island
- Latitude/Longitude: 54°44'27"N 1°15'53"W
- Eastings/Northings: 447435, 538687
- OS Grid: NZ474386
- Mapcode Local: GBR MFLM.Z9
- Mapcode Global: WHD66.J3YD
Location and coordinates are for the approximate centre of Blackhalls Rocks within this administrative area.
Geographic features and populated places may cross administrative borders.