- Category: Water Feature
- Type: Island
- Latitude/Longitude: 55°37'59"N 6°7'40"W
- Eastings/Northings: 140298, 645458
- OS Grid: NR402454
- Mapcode Local: GBR CF7T.RZ0
- Mapcode Global: WGZJS.VN5Y
Location and coordinates are for the approximate centre of Sgeir Mharcaiche within this administrative area.
Geographic features and populated places may cross administrative borders.