- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 52°50'33"N 3°32'30"W
- Eastings/Northings: 296255, 328338
- OS Grid: SH962283
- Mapcode Local: GBR 6G.SXVY
- Mapcode Global: WH67D.KTN7
Location and coordinates are for the approximate centre of Pen y Boncyn Trefeilw within this administrative area.
Geographic features and populated places may cross administrative borders.