- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°46'37"N 3°57'3"W
- Eastings/Northings: 268504, 321742
- OS Grid: SH685217
- Mapcode Local: GBR 5Y.Y0RL
- Mapcode Global: WH56G.8GW8
Location and coordinates are for the approximate centre of Cwm-Mynach within this administrative area.
Geographic features and populated places may cross administrative borders.