- Category: Water Feature
- Type: Island
- Latitude/Longitude: 58°13'20"N 6°46'13"W
- Eastings/Northings: 120005, 935872
- OS Grid: NB200358
- Mapcode Local: GBR 96NZ.ZKQ
- Mapcode Global: WGX1M.ZL3K
Location and coordinates are for the approximate centre of Grèinam within this administrative area.
Geographic features and populated places may cross administrative borders.