- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°49'27"N 3°31'3"W
- Eastings/Northings: 295507, 215038
- OS Grid: SN955150
- Mapcode Local: GBR YJ.W63P
- Mapcode Global: VH5G0.ZD8X
Location and coordinates are for the approximate centre of Llyn Pen-fathor within this administrative area.
Geographic features and populated places may cross administrative borders.