- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°33'12"N 4°3'59"W
- Eastings/Northings: 259991, 297071
- OS Grid: SN599970
- Mapcode Local: GBR 8S.D9D7
- Mapcode Global: VH4DS.G2KW
Location and coordinates are for the approximate centre of Cwm Safn-Ast within this administrative area.
Geographic features and populated places may cross administrative borders.