- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°41'0"N 3°35'59"W
- Eastings/Northings: 289500, 199500
- OS Grid: SS895995
- Mapcode Local: GBR HC.538J
- Mapcode Global: VH5GK.KYBF
Location and coordinates are for the approximate centre of Nant Cwm-cas within this administrative area.
Geographic features and populated places may cross administrative borders.