- Category: Water Feature
- Type: Island
- Latitude/Longitude: 60°12'36"N 1°17'18"W
- Eastings/Northings: 439533, 1147530
- OS Grid: HU395475
- Mapcode Local: GBR R15R.G7R
- Mapcode Global: XHD2Y.MMKK
Location and coordinates are for the approximate centre of Castle Holm within this administrative area.
Geographic features and populated places may cross administrative borders.