- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°56'58"N 3°42'20"W
- Eastings/Northings: 285500, 340500
- OS Grid: SH855405
- Mapcode Local: GBR 68.L69Z
- Mapcode Global: WH66Y.14P2
Location and coordinates are for the approximate centre of Llyn Celyn within this administrative area.
Geographic features and populated places may cross administrative borders.