- Category: Water Feature
- Type: Island
- Latitude/Longitude: 56°33'39"N 5°27'5"W
- Eastings/Northings: 188002, 746322
- OS Grid: NM880463
- Mapcode Local: GBR DCXC.X7T
- Mapcode Global: WH0FT.7C75
Location and coordinates are for the approximate centre of Alaster's Rock within this administrative area.
Geographic features and populated places may cross administrative borders.