- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°44'19"N 3°21'54"W
- Eastings/Northings: 305839, 205330
- OS Grid: SO058053
- Mapcode Local: GBR HP.1N82
- Mapcode Global: VH6CY.MKCD
Location and coordinates are for the approximate centre of Cwm Blacs within this administrative area.
Geographic features and populated places may cross administrative borders.