- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°54'55"N 4°9'4"W
- Eastings/Northings: 255448, 337486
- OS Grid: SH554374
- Mapcode Local: GBR 5P.N637
- Mapcode Global: WH55L.6ZGF
Location and coordinates are for the approximate centre of Llyn Gareg-wen within this administrative area.
Geographic features and populated places may cross administrative borders.