This is a ring-cairn, a type of prehistoric monument in which a roughly circular area is defined not by a solid mound but by a continuous kerbed bank, leaving an open interior. Here the enclosed space measures roughly 8.4 metres across internally, with the bank itself running to an external diameter of around 14 metres. The bank stands only 0.4 metres high, but the internal kerbstones, which line its inner face as a kind of revetment to hold the structure together, reach up to 0.67 metres. The eastern side carries a gap about 3.5 metres wide, which may represent an original entrance or simply a point of later disturbance.

What makes this site more than an isolated curiosity is its context. In 1996, Diarmuid O'Keeffe identified this ring-cairn as part of a much larger landscape of prehistoric activity on the same hill. Alongside it sit several enclosures, multiple hut sites, a clearance cairn, and a field system, all components of what appears to have been a settled and organised upland community at some point in prehistory. Clearance cairns, formed by gathering field stones removed to make ground workable, are often the most modest features in such a complex, yet they say something plain and practical about how people once farmed this now-marginal terrain. The best-preserved kerbing on the ring-cairn survives in the south-east quadrant, where the stonework remains coherent enough to give a sense of how deliberately and carefully the whole structure was originally laid out.