- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°35'41"N 3°44'56"W
- Eastings/Northings: 278940, 189904
- OS Grid: SS789899
- Mapcode Local: GBR H5.BMPQ
- Mapcode Global: VH5H1.Y5VP
Location and coordinates are for the approximate centre of Cwm Dyffryn within this administrative area.
Geographic features and populated places may cross administrative borders.