- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°42'45"N 3°36'42"W
- Eastings/Northings: 291218, 313992
- OS Grid: SH912139
- Mapcode Local: GBR 9D.21F1
- Mapcode Global: WH684.H2CS
Location and coordinates are for the approximate centre of Cwm Cerrig-Duon within this administrative area.
Geographic features and populated places may cross administrative borders.