- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°58'30"N 3°46'40"W
- Eastings/Northings: 277982, 232236
- OS Grid: SN779322
- Mapcode Local: GBR Y5.KMLD
- Mapcode Global: VH5F3.GMN5
Location and coordinates are for the approximate centre of Cwm Mydan within this administrative area.
Geographic features and populated places may cross administrative borders.