- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 54°23'24"N 0°44'5"W
- Eastings/Northings: 482259, 500131
- OS Grid: NZ822001
- Mapcode Local: GBR RK9P.Q2
- Mapcode Global: WHF94.PXBF
Location and coordinates are for the approximate centre of The Tarn within this administrative area.
Geographic features and populated places may cross administrative borders.