At Ballycahillroe, a subtle curve in the boundary wall is the only physical hint that this burial ground may once have sat within an early ecclesiastical enclosure, the kind of circular or oval boundary that defined the sacred precincts of early medieval Irish monasteries and church sites long before formal parish structures existed.

The curved alignment was noted by Swan in 1988, who identified it as possible evidence that the graveyard preserves the arc of such an enclosure. These enclosures, typically formed from earthen banks or stone walls laid out in a rough circle around a church or oratory, were fundamental to the organisation of early Christian settlements in Ireland. They marked the boundary between sacred and secular space, and their shapes often survived for centuries, absorbed into later field boundaries, roads, or, as here, graveyard walls. The fact that the curve is still legible in the existing masonry suggests the later builders either followed the line of an older feature or simply built upon it, preserving its geometry without necessarily knowing why it was there.