At Cinn Aird Thiar on the Iveragh Peninsula, a circular enclosure that was once complete enough to be recorded on the first edition of the Ordnance Survey map now survives only as a southern semicircle, its northern counterpart erased entirely by a later east-west field boundary that cuts straight through the middle of what was once a single enclosed space.

What remains is a semicircular scarp, the steeply eroded edge of a raised platform, sitting 1.1 metres above the surrounding ground and spanning roughly 20.5 metres in diameter. The eastern and western ends are sharply defined, as though the enclosure was simply sliced in two, while the southern side descends more gradually, tapering over about 5.6 metres to the level of the rough pasture around it. Enclosures of this kind, broadly circular earthworks that may have served as ringforts, farmsteads, or ritual spaces depending on their date and context, are scattered across Ireland's Atlantic coast, but the combination of partial survival and documentary evidence here gives the site a particular interest. The first-edition OS map, surveyed in the nineteenth century, captured the enclosure while it was still legible as a whole; the field boundary that destroyed its northern half arrived sometime before or during that agricultural reshaping of the landscape, and simply carried on regardless. A. O'Sullivan and J. Sheehan, compiling their archaeological survey of south Kerry published by Cork University Press in 1996, recorded what was left.

The site sits in rough pasture with views out over Ballinskelligs Bay to the east and south, which means that whatever its original purpose, whoever built it chose a position with a wide prospect over water and low ground. The surviving scarp is the thing to look for, a distinct curved lip of raised earth running in a clean arc before the field boundary interrupts it.