- Category: Water Feature
- Type: Island
- Latitude/Longitude: 58°14'38"N 6°53'33"W
- Eastings/Northings: 113016, 938800
- OS Grid: NB130388
- Mapcode Local: GBR 96CY.3PS
- Mapcode Global: WGX1L.311X
Location and coordinates are for the approximate centre of Grèineam within this administrative area.
Geographic features and populated places may cross administrative borders.