This is a rath, a type of ringfort common across early medieval Ireland, typically consisting of an earthen bank and an external ditch, or fosse, enclosing a roughly circular area where a farming family would have lived. At Lehery, the enclosure measures roughly 62 metres along its longest axis and just over 54 metres across, making it a reasonably substantial example, though you would not immediately guess that from the ground.

What makes this particular site quietly telling is precisely how little of it survives in recognisable form. The surrounding bank, once the defining boundary of the settlement, has been worn down to a height of just half a metre and a width of about three metres, and along much of its southern arc it has been folded into a modern field boundary, repurposed rather than removed. The fosse that would ordinarily accompany such a bank has disappeared entirely, and the original entrance, the point through which people and animals once passed daily, cannot be identified at all. Inside, the enclosed space has been divided into three unequal sections by later field walls, cutting across whatever pattern of use the interior once held. The site illustrates something that happens quietly all across the Irish countryside: early medieval features do not so much vanish as get quietly overwritten, reused, and reorganised by each successive generation of farmers working the same ground.