- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°54'55"N 3°52'13"W
- Eastings/Northings: 274339, 336976
- OS Grid: SH743369
- Mapcode Local: GBR 61.N8BV
- Mapcode Global: WH55Q.JZ69
Location and coordinates are for the approximate centre of Llyn Hiraethlyn within this administrative area.
Geographic features and populated places may cross administrative borders.