- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 54°13'58"N 3°1'35"W
- Eastings/Northings: 333191, 482385
- OS Grid: SD331823
- Mapcode Local: GBR 7M9H.LF
- Mapcode Global: WH834.HV1Y
Location and coordinates are for the approximate centre of Roundsea Tarn within this administrative area.
Geographic features and populated places may cross administrative borders.