- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°48'14"N 3°38'56"W
- Eastings/Northings: 286401, 212994
- OS Grid: SN864129
- Mapcode Local: GBR YB.XHJ6
- Mapcode Global: VH5FY.PXSF
Location and coordinates are for the approximate centre of Cwm Byddar within this administrative area.
Geographic features and populated places may cross administrative borders.