- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°48'1"N 3°13'32"W
- Eastings/Northings: 315580, 212000
- OS Grid: SO155120
- Mapcode Local: GBR YX.XLJF
- Mapcode Global: VH6CV.10KQ
Location and coordinates are for the approximate centre of Cwm Nantmelyn within this administrative area.
Geographic features and populated places may cross administrative borders.