A low, circular mound rises only about forty centimetres above the surrounding ground, its edges traced by a partial kerb of limestone slabs. In winter, it disappears entirely beneath the water. That seasonal vanishing is not incidental; it is, in a sense, the whole point. This is a crannog, an artificial or partly artificial island built in a lake or wetland, typically during the early medieval period in Ireland, and used as a defended dwelling place. Once, before the drainage of Lough Iron, this one would have sat out in open water.

The structure itself is modest but precise. The circular cairn, roughly eight metres in diameter, was laid directly onto the sandy muds of the lakebed rather than on dry land, which tells you something about the effort and intention behind its construction. Its upper surface is level, its profile even, and its sides slope gradually down to the surrounding marsh. A partial kerb of limestone slabs, running along the south and west sides, gives it a degree of definition and edge. Three small oak stakes, each somewhere between thirty and forty centimetres in diameter, remain visible on the western and south-western sides. Wood survives poorly in most conditions, so the presence of these stakes, poking just above the surface, hints at a more substantial timber structure that has long since gone. The site is catalogued by researcher Aidan O'Sullivan, whose 2004 study places it south of the outlet of the River Inny, situating this quiet lump of stone within a broader landscape that would once have been far wetter and more heavily settled than it appears today.

The monument sits in low-lying marshy ground that becomes fully submerged through the winter months, so any visit is essentially a summer or autumn undertaking. Even then, the terrain around the shore of Lough Iron is soft and unreliable underfoot, and the cairn itself is easy to overlook without knowing what you are looking for. What rewards attention is the kerb stonework and, if water levels are low enough, the oak stakes at the western edge, small survivors from whatever life was once organised around this improbable little island.