- Category: Water Feature
- Type: Island
- Latitude/Longitude: 54°51'8"N 4°39'38"W
- Eastings/Northings: 229283, 554095
- OS Grid: NX292540
- Mapcode Local: GBR GHVW.KTR
- Mapcode Global: WH2SS.C9TB
Location and coordinates are for the approximate centre of Castle Island within this administrative area.
Geographic features and populated places may cross administrative borders.