The wall that marks the south-eastern edge of the burial ground is not simply a field boundary or a modern enclosure; it appears to follow the curve of something far older, preserving one quadrant of what was likely a large circular ecclesiastical enclosure.

The observation was made by researcher Swan in 1988, who noted that the graveyard wall at this point traces the arc of what would have been a roughly circular boundary, of the kind commonly associated with early medieval Irish church sites. These circular enclosures, often described in the archaeological literature as curvilinear ecclesiastical enclosures, were a characteristic feature of early Christian settlement in Ireland, typically demarcating a sacred precinct around a church, its associated buildings, and sometimes a burial ground. They survive most often as cropmarks, earthworks, or, as here, as fragments absorbed into later field and boundary systems. What Swan identified at Whitewell is that the south-eastern quadrant of such a circle has been quietly preserved in the graveyard wall, while the rest of the original enclosure has presumably been lost to subsequent land use.

The designation remains cautious, described as a possible enclosure rather than a confirmed one, and only that single quadrant of the postulated circle has been identified. Even so, the fragment is enough to suggest that the graveyard at Whitewell occupies ground with a much longer history of sacred use than its current form might imply.