- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°45'7"N 3°43'42"W
- Eastings/Northings: 280782, 207345
- OS Grid: SN807073
- Mapcode Local: GBR H6.0T07
- Mapcode Global: VH5G9.B775
Location and coordinates are for the approximate centre of Cwm Dulais within this administrative area.
Geographic features and populated places may cross administrative borders.