- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°55'55"N 3°55'1"W
- Eastings/Northings: 271252, 338922
- OS Grid: SH712389
- Mapcode Local: GBR 5Z.M90N
- Mapcode Global: WH55P.SKZG
Location and coordinates are for the approximate centre of Llyn yr Oerfel within this administrative area.
Geographic features and populated places may cross administrative borders.