- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°4'14"N 4°44'59"W
- Eastings/Northings: 211629, 244941
- OS Grid: SN116449
- Mapcode Local: GBR CW.CLGY
- Mapcode Global: VH2MT.M69Y
Location and coordinates are for the approximate centre of Cwm Trewyddel within this administrative area.
Geographic features and populated places may cross administrative borders.