- Category: Water Feature
- Type: Island
- Latitude/Longitude: 58°14'43"N 6°53'37"W
- Eastings/Northings: 112969, 938969
- OS Grid: NB129389
- Mapcode Local: GBR 96CY.36V
- Mapcode Global: WGX1L.20KR
Location and coordinates are for the approximate centre of Cailleach Greinam within this administrative area.
Geographic features and populated places may cross administrative borders.