- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 52°45'16"N 3°25'27"W
- Eastings/Northings: 303978, 318404
- OS Grid: SJ039184
- Mapcode Local: GBR 6M.ZGQP
- Mapcode Global: WH795.C1N0
Location and coordinates are for the approximate centre of Boncyn Celyn within this administrative area.
Geographic features and populated places may cross administrative borders.