- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°4'47"N 4°8'19"W
- Eastings/Northings: 250283, 133363
- OS Grid: SS502333
- Mapcode Local: GBR KM.D9B4
- Mapcode Global: FRA 2668.KD9
Location and coordinates are for the approximate centre of Allen's Rock within this administrative area.
Geographic features and populated places may cross administrative borders.