- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°47'9"N 3°19'57"W
- Eastings/Northings: 310229, 321771
- OS Grid: SJ102217
- Mapcode Local: GBR 6R.XDZH
- Mapcode Global: WH790.S78J
Location and coordinates are for the approximate centre of Cwm Nant Fyllon within this administrative area.
Geographic features and populated places may cross administrative borders.