- Category: Water Feature
- Type: Island
- Latitude/Longitude: 54°20'18"N 3°4'9"W
- Eastings/Northings: 330579, 494195
- OS Grid: SD305941
- Mapcode Local: GBR 7L08.9H
- Mapcode Global: WH71L.T6MS
Location and coordinates are for the approximate centre of Fir Island within this administrative area.
Geographic features and populated places may cross administrative borders.