- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°10'59"N 3°40'22"W
- Eastings/Northings: 285727, 255214
- OS Grid: SN857552
- Mapcode Local: GBR Y9.4PLQ
- Mapcode Global: VH5D6.9D54
Location and coordinates are for the approximate centre of Cwm Gwesyn within this administrative area.
Geographic features and populated places may cross administrative borders.