- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 54°17'46"N 3°5'4"W
- Eastings/Northings: 329500, 489500
- OS Grid: SD295895
- Mapcode Local: GBR 6LWR.ZP
- Mapcode Global: WH71S.L89S
Location and coordinates are for the approximate centre of Allan Tarn within this administrative area.
Geographic features and populated places may cross administrative borders.