- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°51'44"N 3°50'37"W
- Eastings/Northings: 273129, 219798
- OS Grid: SN731197
- Mapcode Local: GBR Y2.SWQD
- Mapcode Global: VH4J6.BG86
Location and coordinates are for the approximate centre of Cwm Nant-dywyll within this administrative area.
Geographic features and populated places may cross administrative borders.