- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°54'19"N 3°36'20"W
- Eastings/Northings: 289636, 224211
- OS Grid: SN896242
- Mapcode Local: GBR YD.Q28D
- Mapcode Global: VH5FL.GC5L
Location and coordinates are for the approximate centre of Cwm Nant-Ddu within this administrative area.
Geographic features and populated places may cross administrative borders.