- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°5'38"N 3°8'30"W
- Eastings/Northings: 321874, 244588
- OS Grid: SO218445
- Mapcode Local: GBR F0.B98Y
- Mapcode Global: VH6BB.HMDJ
Location and coordinates are for the approximate centre of Cwm Byddog within this administrative area.
Geographic features and populated places may cross administrative borders.