Blaengwrach Community is a predominantly upland area, and contains the highest points of three local hills or mountains, namely Mynydd Resolfen (383mt/1257 ft) and the more prominent Mynydd Pen-y-Cae (573mt/1880 ft) and Craig-y-Llyn (600mt/1970 ft), both of which have views of the valley below and the Brecon Beacons in the distance. Craig-y-Llyn is the highest point in the old county of Glamorgan, and is home to a nature reserve containing Llyn Fach and a Site of Special Scientific Interest. West of the summit is Foel Chwern Round cairn.