- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°53'25"N 3°25'15"W
- Eastings/Northings: 304500, 333500
- OS Grid: SJ045335
- Mapcode Local: GBR 6M.PX3K
- Mapcode Global: WH78D.FL7Z
Location and coordinates are for the approximate centre of Nant Cwm Tywyll within this administrative area.
Geographic features and populated places may cross administrative borders.