The enclosure would have measured roughly 110 metres in diameter, making it a substantial circular boundary of the kind that typically defined an early Irish monastic or church site, where a fosse (a ditch) and an accompanying inner bank marked out sacred ground from the world beyond. What survives today amounts to almost nothing visible at ground level, which is precisely what makes its discovery interesting.

The enclosure was identified not by a ground survey but from the air. The researcher Leo Swan spotted it during aerial reconnaissance and described what he saw as the indistinct traces of a large circular fosse or ditch, with a low inner bank now virtually obliterated. Swan published his findings in 1991, and when the site was physically inspected in May 1999, the most that could be confirmed on the ground was a berm, a low, flat shelf of earth, running for about 35 metres and roughly 3.5 metres wide, curving around the hill from the south-west to the west, approximately 20 metres out from the graveyard wall. A church and graveyard still occupy the interior of what would once have been the enclosed precinct, which means the religious use of this elevated ground has persisted even as the boundaries that once formally defined it have all but disappeared. The enclosure is one of many such sites across Ireland where early medieval communities defined their sacred spaces with earthworks that the centuries have since reduced to faint arcs and shadows, legible only from above or through careful measurement on the ground.