- Category: Water Feature
- Type: Island
- Latitude/Longitude: 55°18'10"N 5°41'42"W
- Eastings/Northings: 165565, 607208
- OS Grid: NR655072
- Mapcode Local: IRL XG.G20Y
- Mapcode Global: GBR DGBP.L4Q
Location and coordinates are for the approximate centre of Portan Aluinn within this administrative area.
Geographic features and populated places may cross administrative borders.