- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 54°11'54"N 2°38'32"W
- Eastings/Northings: 358189, 478260
- OS Grid: SD581782
- Mapcode Local: GBR 9MZW.QR
- Mapcode Global: WH94N.CQYT
Location and coordinates are for the approximate centre of Longfield Tarn within this administrative area.
Geographic features and populated places may cross administrative borders.