- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°42'17"N 1°5'1"W
- Eastings/Northings: 464797, 89885
- OS Grid: SZ647898
- Mapcode Local: GBR BF8.NTZ
- Mapcode Global: FRA 87M6.TWJ
Location and coordinates are for the approximate centre of St Helen's Fort within this administrative area.
Geographic features and populated places may cross administrative borders.