- Category: Water Feature
- Type: Island
- Latitude/Longitude: 58°12'1"N 5°20'54"W
- Eastings/Northings: 203331, 928415
- OS Grid: NC033284
- Mapcode Local: GBR F751.NX7
- Mapcode Global: WH171.T4BR
Location and coordinates are for the approximate centre of Stac Gruinn within this administrative area.
Geographic features and populated places may cross administrative borders.