It is a rath, the Irish term for an enclosed ringfort, a type of settlement that was built in great numbers across Ireland during the early medieval period, roughly between the fifth and twelfth centuries. Most were homesteads, their earthen banks defining a household's space and offering a degree of protection for people and livestock alike. This one in Kilkenny is modest by any measure, but its details repay attention.

The enclosure is nearly circular, measuring twenty-three metres north to south and twenty-five metres east to west. It is defined by a low earthen bank, between 1.8 and 3 metres wide, which rises only about 0.4 metres above the interior on the southern side but reaches up to 2 metres in height on the north, where the ground falls away naturally towards the Nuenna river valley. That asymmetry is not unusual; builders of such monuments often worked with the natural slope of the land rather than against it, letting the topography do some of the work. Around the outside of the bank there are very faint traces of a fosse, a defensive ditch, about 2 metres wide, though little of it survives clearly. The entrance, 2.2 metres wide, faces east-south-east, a common orientation for ringforts and one thought by some researchers to reflect a preference for morning light or an eastward-facing symbolic significance.

The site sits in an area described as poor land, which may partly explain its survival. Marginal ground is less likely to have been ploughed out or built over, and forestry cover, while it can damage archaeology through root action, also discourages the kind of agricultural interference that has erased thousands of comparable sites elsewhere in Ireland. The interior slopes gently northward with the natural fall of the ground towards the Nuenna valley, giving the place a quiet, bowl-like character that is easy to overlook unless you are specifically looking for it.