- Category: Water Feature
- Type: Island
- Latitude/Longitude: 60°33'51"N 1°28'39"W
- Eastings/Northings: 428740, 1186870
- OS Grid: HU287868
- Mapcode Local: GBR Q0PT.KN2
- Mapcode Global: XHD14.4QYM
Location and coordinates are for the approximate centre of Gruna Stack within this administrative area.
Geographic features and populated places may cross administrative borders.