- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°29'54"N 3°40'28"W
- Eastings/Northings: 286418, 290276
- OS Grid: SN864902
- Mapcode Local: GBR 99.HPY4
- Mapcode Global: VH5BN.8G7H
Location and coordinates are for the approximate centre of Cwm y Derw within this administrative area.
Geographic features and populated places may cross administrative borders.