- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°25'21"N 3°19'21"W
- Eastings/Northings: 310159, 281339
- OS Grid: SO101813
- Mapcode Local: GBR 9S.NDM6
- Mapcode Global: VH68P.CCBP
Location and coordinates are for the approximate centre of Cwm Nant-ddu within this administrative area.
Geographic features and populated places may cross administrative borders.