- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°57'18"N 3°43'5"W
- Eastings/Northings: 282019, 229904
- OS Grid: SN820299
- Mapcode Local: GBR Y7.LY2K
- Mapcode Global: VH5FB.H4N1
Location and coordinates are for the approximate centre of Cwm Ffos-Ddu within this administrative area.
Geographic features and populated places may cross administrative borders.