Circular in shape, it measures 21 metres in diameter and rises to about 1.5 metres in height, with a sharper central rise of roughly 2 metres across and 0.75 metres high. A carn, in the Irish archaeological tradition, is a cairn, typically a mound of earth and stones raised over a burial or to mark a prominent point in the landscape. This one commands wide views in every direction, which suggests it was placed here deliberately, as an assertion of presence on the hilltop rather than anything tucked discreetly away.

What makes the site quietly puzzling is how little the ground around it has been willing to give up. Two separate programmes of archaeological testing in the surrounding area produced no related material whatsoever. F. Bailey and Y. Whitty tested a site approximately 75 metres to the south in 2006, and Donald Murphy conducted further investigation around 300 metres to the southwest in 2020, the latter prompted by the route of a water-pipe. Neither excavation turned up anything that shed light on the mound's origins or purpose. The carn itself has not been excavated, and so what lies beneath the turf and stones remains genuinely unknown. It is protected as a National Monument in state ownership, which reflects how seriously such unresolved sites are taken even in the absence of dramatic finds.