- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°39'1"N 3°18'13"W
- Eastings/Northings: 309897, 195439
- OS Grid: ST098954
- Mapcode Local: GBR HR.7CP1
- Mapcode Global: VH6DC.PS93
Location and coordinates are for the approximate centre of Cwm Mafon within this administrative area.
Geographic features and populated places may cross administrative borders.