- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°18'47"N 3°4'57"W
- Eastings/Northings: 326296, 268887
- OS Grid: SO262688
- Mapcode Local: GBR B2.WKR2
- Mapcode Global: VH76V.J463
Location and coordinates are for the approximate centre of Cwm Blewyn within this administrative area.
Geographic features and populated places may cross administrative borders.