- Category: Water Feature
- Type: Island
- Latitude/Longitude: 60°34'46"N 0°47'19"W
- Eastings/Northings: 466474, 1189070
- OS Grid: HU664890
- Mapcode Local: GBR S0DS.939
- Mapcode Global: XHF85.5BCW
Location and coordinates are for the approximate centre of Grassy Holm within this administrative area.
Geographic features and populated places may cross administrative borders.