- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°2'54"N 3°20'39"W
- Eastings/Northings: 307903, 239754
- OS Grid: SO079397
- Mapcode Local: GBR YR.F11N
- Mapcode Global: VH6BD.ZR9Z
Location and coordinates are for the approximate centre of Cwm Rhiwiau within this administrative area.
Geographic features and populated places may cross administrative borders.