- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°3'39"N 1°47'45"W
- Eastings/Northings: 414400, 129081
- OS Grid: SU144290
- Mapcode Local: GBR 51F.GR5
- Mapcode Global: FRA 7649.S79
Location and coordinates are for the approximate centre of St John's Island within this administrative area.
Geographic features and populated places may cross administrative borders.