- Category: Water Feature
- Type: Island
- Latitude/Longitude: 55°43'8"N 4°56'34"W
- Eastings/Northings: 215247, 651202
- OS Grid: NS152512
- Mapcode Local: GBR GF5L.NKV
- Mapcode Global: WH2ND.1JG5
Location and coordinates are for the approximate centre of Castle Island within this administrative area.
Geographic features and populated places may cross administrative borders.