- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°5'39"N 3°39'5"W
- Eastings/Northings: 289500, 356500
- OS Grid: SH895565
- Mapcode Local: GBR 6B.91GQ
- Mapcode Global: WH665.WHB7
Location and coordinates are for the approximate centre of Llyn Alwen within this administrative area.
Geographic features and populated places may cross administrative borders.