- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°58'54"N 4°51'4"W
- Eastings/Northings: 204290, 235318
- OS Grid: SN042353
- Mapcode Local: GBR CQ.KCBJ
- Mapcode Global: VH1QP.VGP3
Location and coordinates are for the approximate centre of Cwm Mawr within this administrative area.
Geographic features and populated places may cross administrative borders.