- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°31'21"N 3°50'22"W
- Eastings/Northings: 275291, 293221
- OS Grid: SN752932
- Mapcode Local: GBR 92.G59R
- Mapcode Global: VH4DX.DVKK
Location and coordinates are for the approximate centre of Llyn Penrhaeadr within this administrative area.
Geographic features and populated places may cross administrative borders.