- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°58'42"N 4°8'19"W
- Eastings/Northings: 256500, 344500
- OS Grid: SH565445
- Mapcode Local: GBR 5P.J94C
- Mapcode Global: WH55D.DDFD
Location and coordinates are for the approximate centre of Llyn Cwmystradllyn within this administrative area.
Geographic features and populated places may cross administrative borders.