At Garryduff in Co. Kilkenny, a roughly D-shaped enclosure once occupied a large agricultural field, measuring approximately 50 metres along its northeast to southwest axis and 45 metres across. It was substantial enough to be recorded on the first edition Ordnance Survey six-inch map of 1839, and it was still there, at least in outline, when the OS returned to revise the map around 1900. At some point after that, it was levelled. The field, kept under tillage, gives no sign today that anything was ever there.

Enclosures of this kind are among the more common, if still poorly understood, features of the Irish rural landscape. They typically served as farmsteads or settlement boundaries in the early medieval period, and the D-shape noted here, one straight or slightly curved side meeting a rounded arc, is a recognised variant of the more familiar circular rath or ringfort. What made the Garryduff example particular, whether it enclosed a house site, a souterrain (an underground stone-lined passage sometimes attached to such settlements), or any other internal feature, was never recorded before the ground was cleared. The cartographic record is all that remains.