- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°43'33"N 3°55'13"W
- Eastings/Northings: 270414, 315998
- OS Grid: SH704159
- Mapcode Local: GBR 8Z.19DS
- Mapcode Global: WH56N.RQCZ
Location and coordinates are for the approximate centre of Llyn Gwernan within this administrative area.
Geographic features and populated places may cross administrative borders.