- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°52'39"N 4°23'40"W
- Eastings/Northings: 235266, 222604
- OS Grid: SN352226
- Mapcode Local: GBR DB.RYBZ
- Mapcode Global: VH3LF.S23G
Location and coordinates are for the approximate centre of Cwm Gwernen within this administrative area.
Geographic features and populated places may cross administrative borders.