- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°45'19"N 4°9'10"W
- Eastings/Northings: 251500, 208500
- OS Grid: SN515085
- Mapcode Local: GBR GS.PQMR
- Mapcode Global: VH3M4.Y4XL
Location and coordinates are for the approximate centre of Mynydd Sylen within this administrative area.
Geographic features and populated places may cross administrative borders.