- Category: Water Feature
- Type: Island
- Latitude/Longitude: 56°13'37"N 4°16'17"W
- Eastings/Northings: 259265, 706151
- OS Grid: NN592061
- Mapcode Local: GBR 0Z.CLB9
- Mapcode Global: WH3MB.CR45
Location and coordinates are for the approximate centre of Portnellan Island within this administrative area.
Geographic features and populated places may cross administrative borders.