- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°31'0"N 3°51'36"W
- Eastings/Northings: 273886, 292626
- OS Grid: SN738926
- Mapcode Local: GBR 92.GD8H
- Mapcode Global: VH4DX.1ZQX
Location and coordinates are for the approximate centre of Llyn Dwfn within this administrative area.
Geographic features and populated places may cross administrative borders.