- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°47'33"N 3°57'59"W
- Eastings/Northings: 267500, 323500
- OS Grid: SH675235
- Mapcode Local: GBR 5X.X2Z8
- Mapcode Global: WH56G.12HB
Location and coordinates are for the approximate centre of Llyn Cwm-mynach within this administrative area.
Geographic features and populated places may cross administrative borders.