- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°37'26"N 3°6'52"W
- Eastings/Northings: 322942, 192280
- OS Grid: ST229922
- Mapcode Local: GBR J0.8Z5V
- Mapcode Global: VH6DN.YFTT
Location and coordinates are for the approximate centre of Cwm Byr within this administrative area.
Geographic features and populated places may cross administrative borders.