- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°26'19"N 3°35'11"W
- Eastings/Northings: 289822, 172270
- OS Grid: SS898722
- Mapcode Local: GBR HD.NLKN
- Mapcode Global: VH5HX.S39F
Location and coordinates are for the approximate centre of Cwm Mawr within this administrative area.
Geographic features and populated places may cross administrative borders.