- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°56'11"N 3°52'54"W
- Eastings/Northings: 273626, 339345
- OS Grid: SH736393
- Mapcode Local: GBR 60.M5JN
- Mapcode Global: WH55Q.BGR2
Location and coordinates are for the approximate centre of Llyn y Graig-wen within this administrative area.
Geographic features and populated places may cross administrative borders.