- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 53°1'21"N 4°14'55"W
- Eastings/Northings: 249265, 349637
- OS Grid: SH492496
- Mapcode Local: GBR 5K.FLC2
- Mapcode Global: WH440.P9Y2
Location and coordinates are for the approximate centre of Cwm Dulyn within this administrative area.
Geographic features and populated places may cross administrative borders.