- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°59'53"N 5°0'18"W
- Eastings/Northings: 193795, 237582
- OS Grid: SM937375
- Mapcode Local: GBR CJ.J94T
- Mapcode Global: VH1QM.618F
Location and coordinates are for the approximate centre of Cwm Celyn within this administrative area.
Geographic features and populated places may cross administrative borders.