It is not. The island is a crannog, an artificial construction built by human hands from stone and earth, roughly circular in shape and approximately thirty metres across. Its outer edge is formed by a revetment of large square stones, a kind of retaining wall, with a substantial dump of stone and earth piled inside to raise the ground level. At the centre of the island stands a subrectangular stone structure, and on its eastern side, just beneath the waterline, a narrow stone-built jetty stretches out seven to eight metres into the lake, defined by two parallel linear stone features. That submerged jetty is perhaps the most quietly telling detail: it speaks to a time when boats came and went regularly, and when this small island mattered.

Crannogs were built across Ireland and Scotland from prehistory into the early modern period, and scholars classify them in various ways according to their construction. This example has been identified as a possible high-cairn crannog, a type characterised by its raised, heavily built-up profile, and it is thought to date to the late medieval period. That dating, if confirmed, connects it to one of the more significant political geographies of medieval Connacht. Researchers have suggested it may have formed part of the 'Callow cenn áit', a term meaning a lordly centre or chief place, associated with the Ó Cellaig, the O'Kelly dynasty who held sway over the territories of Uí Maine and Tír Maine. A castle on the shoreline roughly 180 metres to the south-south-west is thought to be related, suggesting that the lough and its island were part of a broader complex of power and habitation rather than an isolated structure. The Ó Cellaig were one of the principal Gaelic families of east Connacht, and the possibility that this unassuming lake island once anchored their local authority gives it a weight that its quiet, wooded appearance does little to advertise.