- Category: Water Feature
- Type: Island
- Latitude/Longitude: 58°13'47"N 6°54'42"W
- Eastings/Northings: 111778, 937319
- OS Grid: NB117373
- Mapcode Local: GBR 96BZ.6X3
- Mapcode Global: WGX1K.SDTN
Location and coordinates are for the approximate centre of Sionaso within this administrative area.
Geographic features and populated places may cross administrative borders.