Two cairns in forestry, one very damaged, the other on the highest point of the hill (528m OD).
Coflein descriptions:
Bachgen Carreg (SS90819810)
A ruined circular cairn, 8.0m in diameter and 0.5m high, set on a parish boundary and bearing the name of a stone rather than that of a cairn.
Mynydd Blaengwynfi summit (SS90659737)
A circular, stony mound, 7.6m in diameter and 0.6m high, capped by an OS triangulation pillar.