- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°45'34"N 3°51'23"W
- Eastings/Northings: 271960, 208387
- OS Grid: SN719083
- Mapcode Local: GBR H0.0BNL
- Mapcode Global: VH4JS.31JH
Location and coordinates are for the approximate centre of Cwm-Nant-Ystafell within this administrative area.
Geographic features and populated places may cross administrative borders.