The enclosure at Lackendarragh is D-shaped, roughly ninety metres along its straight side and projecting a similar distance to the northeast, with a stream forming its southwestern boundary and an earthen bank, stone-faced in places and now heavily overgrown with bushes, completing the circuit elsewhere. A modern road cuts through it on a northwest-southeast axis, which is the kind of casual severance that happens to ancient sites over centuries without anyone much remarking on it. There is also a small stone-lined opening at the base of the bank to the east, the sort of detail that rewards a closer look.

Within the northeastern half of the enclosure, four distinct features cluster together in a way that points to sustained, layered use across a long period. The ringfort known as Kilcullin Fort takes its name from the Irish cill, meaning a church or early monastic cell, which hints at the ecclesiastical character the enclosure as a whole seems to have held. Alongside it sit a burial ground, a souterrain, and a standing stone. A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement in Ireland, used variously for storage or refuge. The standing stone is likely far older, possibly prehistoric, which would mean the ecclesiastical community established itself within a landscape already marked out as significant. That the burial ground, the ringfort with its church-name, and the souterrain all occupy the same northeastern portion of the enclosure suggests this was the active, inhabited core, while the broader D-shaped boundary defined the sacred or protected territory around it.

The site sits on a southwest-facing slope in pasture, and the earthen bank, though obscured by vegetation, is apparently visible in parts where the stone facing shows through. The break in the bank to the east-southeast may mark an original entrance, and the stone-lined opening near the base of the eastern bank is an unusual feature worth noting on approach.