- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°51'3"N 3°8'28"W
- Eastings/Northings: 323236, 328788
- OS Grid: SJ232287
- Mapcode Local: GBR 6Z.SKFF
- Mapcode Global: WH78Q.QL9M
Location and coordinates are for the approximate centre of Llyn Rhuddwyn within this administrative area.
Geographic features and populated places may cross administrative borders.