- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°44'53"N 3°10'44"W
- Eastings/Northings: 318695, 206148
- OS Grid: SO186061
- Mapcode Local: GBR HY.111G
- Mapcode Global: VH6D1.VB57
Location and coordinates are for the approximate centre of Cwm Merddog within this administrative area.
Geographic features and populated places may cross administrative borders.