It is not a natural feature of the lough but a crannog, an artificial island built from stone and deliberately placed in open water, most likely during the early medieval period. Crannogs served as defensible dwellings or storage sites, their position in water providing a natural barrier against cattle raids and rival clans. This one measures roughly 35 metres east to west and 20 metres north to south, a subcircular platform of stacked stone now so densely overgrown with vegetation that its constructed origins are easy to overlook.

What gives the site a particular quiet interest is the trace of a possible causeway running off to the north-east. Causeways connecting crannogs to the shore were not always built to be permanent or obvious; some were deliberately submerged just below the waterline, so that only those who already knew the route could navigate it safely. Whether the feature here served that purpose, or was simply a later addition, is not recorded, but its presence suggests the island was intended to be reached, not merely observed from a distance.