- Category: Water Feature
- Type: Island
- Latitude/Longitude: 54°19'28"N 2°57'4"W
- Eastings/Northings: 338231, 492532
- OS Grid: SD382925
- Mapcode Local: GBR 7LTF.VJ
- Mapcode Global: WH82S.MKVK
Location and coordinates are for the approximate centre of Grass Holme within this administrative area.
Geographic features and populated places may cross administrative borders.