- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°58'40"N 4°8'36"W
- Eastings/Northings: 256186, 344440
- OS Grid: SH561444
- Mapcode Local: GBR 5P.JFYT
- Mapcode Global: WH55D.BD6V
Location and coordinates are for the approximate centre of Llyn Cwmystradllyn within this administrative area.
Geographic features and populated places may cross administrative borders.