- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°40'47"N 2°52'9"W
- Eastings/Northings: 339986, 198264
- OS Grid: ST399982
- Mapcode Local: GBR JC.56YJ
- Mapcode Global: VH7B2.61XJ
Location and coordinates are for the approximate centre of Cwm Byr within this administrative area.
Geographic features and populated places may cross administrative borders.