- Category: Water Feature
- Type: Island
- Latitude/Longitude: 58°21'2"N 6°39'57"W
- Eastings/Northings: 127133, 949722
- OS Grid: NB271497
- Mapcode Local: GBR 96XN.KJQ
- Mapcode Global: WGX13.KCZK
Location and coordinates are for the approximate centre of Tarsgeir within this administrative area.
Geographic features and populated places may cross administrative borders.