That small uncertainty quietly defines An Chathair Bhearnach, a ringfort on the Iveragh Peninsula in County Kerry whose enclosing bank has been so absorbed into the farmed landscape that the two gaps now providing access to the interior are thought to be later intrusions rather than original features. A univallate rath, meaning a ringfort defined by a single enclosing bank and ditch rather than multiple concentric ones, it sits on gently south-sloping ground roughly 350 metres north of Lough Currane, with the Coomduff ridge extending away to the north-east. The interior measures approximately 27.3 metres north to south and 29.5 metres east to west, making it a substantial enclosure of the kind that would once have sheltered a farmstead and its inhabitants during the early medieval period.

The bank itself is a small study in how the landscape quietly reconfigures ancient structures. A field boundary has been laid directly over its northern half, and three field walls radiate outward from it, suggesting the rath was absorbed into a later agricultural pattern rather than simply abandoned. Beneath the heavy grass cover, stones can be detected in the composition of the bank, and the collapse of material along its inner face points to the possibility that it was originally drystone-faced, its outer earthen form concealing what was once a more deliberately constructed stone wall. At the southern arc the bank is best preserved, standing 2.75 metres high on its outer face and 0.6 metres on the inner, with a crest width of just 1.1 metres. The outer flank splays widely and is thick with furze. In the north-western quadrant, the remains of a circular hut survive beneath a covering of sod, its stone walls still reaching 0.7 metres in external height and enclosing an internal space of 4.5 metres in diameter, a modest but legible footprint of domestic life within the rath's protective circuit.