The ground rises only a few centimetres above the level interior, and the stone beneath the turf has spread and flattened over centuries until it resembles little more than a broad, slightly raised hem around a field. Yet the geometry is too deliberate, too consistent, to be accidental. This is a cashel, a stone-walled ringfort of the kind built across early medieval Ireland as an enclosure for a farmstead or small settlement, and it has been sitting here, slowly dissolving into the hillside, for longer than anyone has precisely measured.

When the antiquarian Thomas Johnson Westropp visited in 1905, he described what he found on the edge of Ballycasheen as "mere foundations", which is a fair summary of what the site had already become by that point. The 1840 Ordnance Survey six-inch map recorded it using hachuring, the cartographic shorthand for an earthwork or raised feature, suggesting the remains were more legible then than now. What survives is an oval enclosure measuring roughly 31 metres east to west and 23 metres north to south, with a wall spread that varies considerably in width, from around 4 metres on the northern side to nearly 9 metres on the west, where it is also at its most substantial in terms of external height. Some potential facing stones are still visible, and a later cut into the eastern side of the spread has exposed the underlying stonework. The site commands views extending up to 2 kilometres in most directions, with shorter sightlines to the west and north, a positioning that reflects the practical logic of early settlement as much as anything else. Complicating the picture is the evidence that the site was deliberately levelled at some point before a network of later drystone walls was built around it; those walls abut three sides of the cashel, and the stone spread can be traced running beneath their bases, meaning the earlier structure was already being incorporated, and partially obscured, into a later agricultural landscape before the antiquarians ever arrived.