- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°44'0"N 3°15'34"W
- Eastings/Northings: 313106, 204602
- OS Grid: SO131046
- Mapcode Local: GBR HT.1YM9
- Mapcode Global: VH6D0.GP3J
Location and coordinates are for the approximate centre of Cwm Rhymni within this administrative area.
Geographic features and populated places may cross administrative borders.