- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°55'1"N 3°34'54"W
- Eastings/Northings: 291312, 225464
- OS Grid: SN913254
- Mapcode Local: GBR YF.PG5J
- Mapcode Global: VH5FL.V2VP
Location and coordinates are for the approximate centre of Cwm Treweryn within this administrative area.
Geographic features and populated places may cross administrative borders.