There is no earthwork, no trace of stonework, no depression in the grass. The only way it announced itself was through geophysical survey, the kind of ground-scanning work that detects buried anomalies by measuring changes in soil resistance or magnetism, and it did so not because anyone suspected it was there, but because a solar farm was being planned for the area.

The surveys, carried out in 2017 in advance of that proposed development, revealed not just one enclosure but a cluster of them in the same vicinity, at least ten distinct features identified in close proximity to one another. This particular example is square in plan, with a clear entrance set towards the western end of its southern side. Attached to its west is an annexe of similar dimensions, formed by a continuation of the northern and southern walls of the main enclosure, though on a slightly different alignment and without a well-defined western boundary. More striking still, the southwestern corner of the main enclosure and the southeastern corner of the annexe both overlie an earlier enclosure that predates the whole arrangement. Archaeology layered on archaeology, none of it visible at the surface, each phase detectable only as a faint signal in the earth.

Square or rectangular enclosures of this kind are less commonly recorded in Ireland than their circular counterparts, which makes their appearance here, in multiples, quietly unusual. What they were used for, and when, remains unresolved; without excavation, geophysics can confirm that something is buried but cannot say what it is or who made it. The enclosures at Ballyconra remain, for now, a set of shapes in the ground, patient and unexcavated, waiting for a question someone has not yet thought to ask.