- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°48'7"N 4°4'50"W
- Eastings/Northings: 256632, 213539
- OS Grid: SN566135
- Mapcode Local: GBR DR.XQGP
- Mapcode Global: VH4J8.7Y2W
Location and coordinates are for the approximate centre of Cwm-Mwyn within this administrative area.
Geographic features and populated places may cross administrative borders.