The enclosure is estimated at roughly 270 metres in diameter, though today it survives as little more than a tumbled line of stone, no more than 0.2 to 0.4 metres high in places and just under three metres wide at its northern stretch. What makes it easy to overlook is precisely what makes it legible: the later field boundaries in the area were laid out to follow its curving line, so the ancient perimeter has been quietly preserved inside the geometry of the modern landscape.

The enclosure surrounds the entire ecclesiastical complex at Oughtmama, a site with two early churches lying toward the western side. A second, smaller enclosure sits concentrically within the outer one, wrapping specifically around those two churches. In early medieval Ireland, this kind of nested arrangement, with an inner sanctum and a broader outer precinct, was a standard way of organising monastic and ecclesiastical land. The zone between the two enclosures has since been divided into narrow striped fields, a pattern of land subdivision that in itself points to considerable age. One wall running between the inner and outer enclosures doubles as a townland boundary, and this alignment may preserve the line of an even older internal division within the original complex, a ghost of an earlier spatial logic that neither the churches nor the field system that followed them entirely erased.