- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°46'34"N 3°8'55"W
- Eastings/Northings: 320845, 209238
- OS Grid: SO208092
- Mapcode Local: GBR F0.Z7M6
- Mapcode Global: VH6CW.CMR7
Location and coordinates are for the approximate centre of Cwm Celyn within this administrative area.
Geographic features and populated places may cross administrative borders.