A souterrain is an underground passage or chamber, typically built in early medieval Ireland for storage or refuge, and one was recorded here by a certain Cooke in 1906. It has not been located since. That quiet disappearance gives this particular rath, a type of circular earthwork enclosure used as a farmstead during the early medieval period, an extra layer of obscurity beyond the usual agricultural neglect.

The rath sits on a natural rise in pastureland drained by tributaries of the River Laune, a landscape that would have made it a sensible and defensible position for a farming family perhaps twelve or fourteen centuries ago. The enclosure measures roughly 23.5 metres north to south and 24 metres east to west, placing it in the middle range for such sites. Its bank, composed of stone and earth, survives to an average external height of 1.65 metres with a basal width of 2.4 metres, dropping about a metre on the interior face. Along the northern sector, traces of external drystone revetting, the technique of facing an earthen bank with carefully laid unmortared stone, are still visible. Beyond the bank, a fosse, or defensive ditch, once ran around the perimeter; it is best preserved in the north-east sector, where it remains about a metre wide and thirty centimetres deep. To the north-west, field clearance material has been piled against the bank over the years, obscuring the fosse entirely. A gap of roughly 2.3 metres on the western side is thought to mark the original entrance.