- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°43'40"N 3°58'7"W
- Eastings/Northings: 267152, 316304
- OS Grid: SH671163
- Mapcode Local: GBR 8X.19G9
- Mapcode Global: WH56N.0PFH
Location and coordinates are for the approximate centre of Llyn Wylfa within this administrative area.
Geographic features and populated places may cross administrative borders.