- Category: Water Feature
- Type: Island
- Latitude/Longitude: 60°19'49"N 0°59'2"W
- Eastings/Northings: 456202, 1161140
- OS Grid: HU562611
- Mapcode Local: GBR R1XF.HPT
- Mapcode Global: XHF97.ML2V
Location and coordinates are for the approximate centre of Grunnels Stack within this administrative area.
Geographic features and populated places may cross administrative borders.