A roughly circular area of around fifteen metres in diameter, perceptible only as a faint change in the contour of the ground, is all that remains of what was once a mapped enclosure. At the eastern edge, a slightly raised outline betrays its former shape, but you would need to know what you were looking at to read it as anything other than a gentle irregularity in the field.

The enclosure appeared on the 1837 edition of the Ordnance Survey six-inch map, the great early nineteenth-century cartographic project that captured Ireland's landscape in extraordinary detail, recording field boundaries, ruins, and earthworks that were already ancient or fading at the time of survey. By the time later editions were produced, the enclosure had been removed from the record entirely, suggesting it was levelled sometime in the intervening decades, most likely as agricultural land was brought into more intensive use. Circular enclosures of this kind are common across Ireland and typically served as enclosed farmsteads or settlements, sometimes dating to the early medieval period, though nothing in what survives at Ballygreighan confirms a precise date or function. What the 1837 map preserved, and what the ground still faintly echoes, is the memory of a boundary that somebody once thought worth drawing.