- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°46'26"N 3°17'27"W
- Eastings/Northings: 311031, 209154
- OS Grid: SO110091
- Mapcode Local: GBR YT.ZGB3
- Mapcode Global: VH6CS.XN3X
Location and coordinates are for the approximate centre of Cwm Mawr within this administrative area.
Geographic features and populated places may cross administrative borders.