- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°39'14"N 3°34'32"W
- Eastings/Northings: 293518, 307405
- OS Grid: SH935074
- Mapcode Local: GBR 9F.5Y1X
- Mapcode Global: WH68C.1KM9
Location and coordinates are for the approximate centre of Llyn Gwyddior within this administrative area.
Geographic features and populated places may cross administrative borders.