- Category: Water Feature
- Type: Island
- Latitude/Longitude: 60°9'48"N 1°29'27"W
- Eastings/Northings: 428351, 1142220
- OS Grid: HU283422
- Mapcode Local: GBR Q1NW.CHH
- Mapcode Global: XHD31.ZSBW
Location and coordinates are for the approximate centre of Grossa Stack within this administrative area.
Geographic features and populated places may cross administrative borders.