At just 0.4 metres high, the feature is easy to dismiss as a natural undulation in the ground, but its gentle curve follows the arc of an enclosure that was still legible enough to be mapped in the third edition of the Ordnance Survey six-inch series, published in 1933. By the time anyone thought to record it archaeologically, the enclosure had already retreated almost entirely into the soil.

Enclosures of this kind, typically circular or sub-circular earthworks defined by a bank and sometimes a ditch, are among the most common prehistoric and early medieval monument types in Ireland, though their individual histories are rarely straightforward to read. Here, an additional layer of time has settled on top. The 1933 OS map shows a house positioned on the site, probably sitting within what would have been the interior of the enclosure. That building, almost certainly making use of the slight natural rise on which the enclosure sits, some 100 metres south-east of Lissard House, is now itself a ruin. The sequence is quietly legible: an ancient boundary, then a later dwelling built inside it, and now both reduced to low humps and collapsed walls in the same field.