- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°7'9"N 3°30'41"W
- Eastings/Northings: 296610, 247853
- OS Grid: SN966478
- Mapcode Local: GBR YJ.8MLY
- Mapcode Global: VH5DH.2ZZQ
Location and coordinates are for the approximate centre of Cwm Graig-ddû within this administrative area.
Geographic features and populated places may cross administrative borders.