- Category: Water Feature
- Type: Island
- Latitude/Longitude: 60°30'16"N 1°36'49"W
- Eastings/Northings: 421311, 1180170
- OS Grid: HU213801
- Mapcode Local: GBR Q0CZ.98F
- Mapcode Global: XHD1G.C7MC
Location and coordinates are for the approximate centre of Gruna Stack within this administrative area.
Geographic features and populated places may cross administrative borders.