- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°55'42"N 3°54'47"W
- Eastings/Northings: 271500, 338500
- OS Grid: SH715385
- Mapcode Local: GBR 5Z.MHYF
- Mapcode Global: WH55P.VNT9
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.