- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°57'10"N 3°5'8"W
- Eastings/Northings: 325483, 228808
- OS Grid: SO254288
- Mapcode Local: GBR F2.M57D
- Mapcode Global: VH78L.G5KT
Location and coordinates are for the approximate centre of Cwm Trethiw within this administrative area.
Geographic features and populated places may cross administrative borders.