- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°52'40"N 3°24'44"W
- Eastings/Northings: 305041, 332088
- OS Grid: SJ050320
- Mapcode Local: GBR 6M.QRLH
- Mapcode Global: WH78D.KX7P
Location and coordinates are for the approximate centre of Cwm-Pen-Llydan within this administrative area.
Geographic features and populated places may cross administrative borders.