The enclosure only reveals itself through the differential growth of plants over buried features, a phenomenon known as a cropmark, where the soil disturbance of a long-filled ditch causes vegetation to grow taller or shorter than the surrounding field, tracing the outline of something that was once substantial.

The enclosure is roughly oval in plan, measuring approximately 63 metres along its northwest to southeast axis and around 50 metres across. It was defined by a fosse, which is simply a broad ditch, here about 3 metres wide, dug to demarcate the enclosed space. Enclosures of this kind are common across Ireland, and while their functions vary, many are associated with early medieval settlement, though some may be prehistoric in origin. In this case the feature was identified and reported by Jean-Charles Caillère, who spotted it on satellite imagery, the kind of quiet, methodical observation that continues to add entries to the archaeological map of Ireland long after the era of large-scale fieldwork surveys.