- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°38'48"N 3°43'34"W
- Eastings/Northings: 283305, 306843
- OS Grid: SH833068
- Mapcode Local: GBR 97.69U1
- Mapcode Global: WH688.QQSV
Location and coordinates are for the approximate centre of Cwm Gwern within this administrative area.
Geographic features and populated places may cross administrative borders.