The ringfort here, roughly thirty metres across, has been absorbed so thoroughly into the working landscape that its earthen bank now doubles as part of the field boundary system along its southern arc. That kind of layering, an early medieval structure pressed into service as a modern field division, is not unusual in Ireland, but it does mean the site reads differently depending on which side of the hedge you are standing on.

A rath, as ringforts built from earth rather than stone are commonly called, was typically a farmstead enclosure dating from the early medieval period, roughly 500 to 1000 AD, used to define and protect a family's dwelling and livestock. This one follows the expected circular form, with a bank that is about two and a third metres wide and just over a metre tall on the interior face. The western side of the interior has been deliberately levelled up to compensate for the natural slope of the hillside, a small piece of engineering that speaks to whoever built it wanting a flat, usable space inside. The bank is breached in four places, at the east, south-east, south-west, and west-south-west, and a trackway runs east to west between the south-east and south-west openings, suggesting the enclosure was orientated around a clear line of movement through it. A north-south lane running along the outside of the western bank cuts slightly into it, showing how later routeways continued to interact with the structure across the centuries. The site was noted as early as the 1840s, when Ordnance Survey fieldworkers placed it at the west end of Knockacullig South in the parish of Kilcummin.