- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°15'45"N 4°31'49"W
- Eastings/Northings: 231327, 376938
- OS Grid: SH313769
- Mapcode Local: GBR HN52.KJZ
- Mapcode Global: WH42Q.C8X5
Location and coordinates are for the approximate centre of Llyn Penrhyn within this administrative area.
Geographic features and populated places may cross administrative borders.