- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°51'59"N 4°46'22"W
- Eastings/Northings: 209173, 222307
- OS Grid: SN091223
- Mapcode Local: GBR CV.SLPY
- Mapcode Global: VH2NS.7B1X
Location and coordinates are for the approximate centre of Cwm-Brechfa within this administrative area.
Geographic features and populated places may cross administrative borders.