Two round barrows on the western summit of Mynydd Margam. Coflein descriptions:
Mynydd Margam Beacon (SS81918885)
A circular mound, 14m in diameter and 1.2m high, upon the highest point of Mynydd Margam has been assumed to have been a beacon site.
Mynydd Margam South (SS82018868)
A circular mound, 18m in diameter and 0.6m high.