There is no gateway, no gap, no obvious point of entry; the wall simply continues all the way around, giving the site an oddly self-contained quality, as though it were built to keep something in rather than people out.

This is a cashel, the term used for a ringfort constructed from stone rather than an earthen bank and ditch. Ringforts were the dominant form of enclosed farmstead in early medieval Ireland, typically dating from around the sixth to the tenth century, and several thousand survive across the country in varying states of preservation. This particular example is a circular, grass-covered enclosure with an internal diameter of roughly 28 metres and an overall external diameter of about 35 metres. The enclosing stone spread is between 2.5 and 3.5 metres wide, rising to about 0.6 metres on the interior side and a more substantial 2 metres on the exterior. What adds an extra layer of interest is that the southern to western arc of the wall has been absorbed into the overgrown boundary dividing the townlands of Killian and Ballycarroll. It is a quiet illustration of how ancient structures get pressed into later use, their original purpose forgotten while their physical bulk continues to serve a practical, if very different, function. The boundary essentially borrowed the cashel, and in doing so helped preserve it.