- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°50'55"N 3°22'52"W
- Eastings/Northings: 307075, 328805
- OS Grid: SJ070288
- Mapcode Local: GBR 6P.SM4D
- Mapcode Global: WH78M.1N4H
Location and coordinates are for the approximate centre of Cwm yr Ast within this administrative area.
Geographic features and populated places may cross administrative borders.