- Category: Water Feature
- Type: Island
- Latitude/Longitude: 57°8'37"N 5°46'56"W
- Eastings/Northings: 171274, 812221
- OS Grid: NG712122
- Mapcode Local: GBR D93V.255
- Mapcode Global: WH0BR.4PQX
Location and coordinates are for the approximate centre of Eilean Sionnach within this administrative area.
Geographic features and populated places may cross administrative borders.