Running from west to north and on to north-north-east, it describes an arc that some researchers believe preserves the outline of a much older ecclesiastical enclosure, the kind of curvilinear boundary that typically surrounded an early Irish monastic or church site, demarcating sacred ground from the world beyond.

The question was first raised in 1984, when Sheehan examined aerial photography of the site and noted that the graveyard appeared to form part of a larger enclosure. Swan followed up in 1988, pointing to the curved, quadrantal form of the graveyard's boundary wall as possible evidence of an earlier enclosure beneath or behind it. Ecclesiastical enclosures of this type are a recognised feature of early medieval Irish Christianity, often circular or oval in plan, and their outlines sometimes survive only as faint traces in later field boundaries, roads, or walls. The difficulty at Kilcumreragh is that the graveyard wall post-dates 1700, and the hillock on which the site sits offers an alternative explanation: the wall may simply follow the natural contour of the ground rather than the line of any ancient boundary. The evidence, in other words, is suggestive rather than conclusive, and the site sits in that uncertain territory where landscape and archaeology refuse to give a clear answer.