This ringfort in Barna townland, County Limerick, sits just twenty metres from the river, which at this point marks the boundary with the neighbouring townland of Ballynamuddagh. A ringfort, sometimes called a rath, is an enclosed farmstead of early medieval Ireland, typically defined by one or more earthen banks and ditches surrounding a raised interior where a family would have lived and kept livestock. What makes this one quietly interesting is the degree to which later agricultural life has absorbed it: a field boundary bisects the northeastern arc, a waterlogged fosse has been folded into the working landscape of the farm, and the interior is now overgrown scrub rather than the swept yard it once was.

The earliest cartographic record of the site appears on the 1840 edition of the Ordnance Survey six-inch map, where it is shown as a raised circular area defined by a scarp. By the time the 1897 edition of the OS twenty-five-inch map was made, the bank and its external fosse, the ditch that once ran outside the bank, were clearly depicted along the southeastern, southern, western, and northwestern arcs. The Archaeological Survey of Ireland visited and measured the site in 1999. Their survey recorded a nearly circular enclosure, roughly 23.7 metres north to south and 24 metres east to west, with a bank averaging 4.5 metres in overall width. The interior face of the bank stands only 0.45 metres above the enclosed ground, while the exterior face rises 1.45 metres, a difference partly explained by the monument's position on a gentle northwest-facing slope; the interior was built up slightly to compensate for the natural gradient. A possible original entrance gap, around 3.1 metres wide, was identified at the north-northeast. A second, narrower gap at the west appears to be a modern insertion. Another enclosure lies 110 metres to the northwest, which raises the possibility that the two features were once part of a shared landscape of early settlement.

The site sits in working pasture, so access depends entirely on the landowner's permission. Those who do visit should expect scrub-covered ground rather than a cleared monument; aerial imagery from the early 2010s confirms the interior remains heavily overgrown. The bank is most legible from the exterior, particularly along the southern and western arcs where the fosse and outer face are best preserved. The River Aherlow nearby offers a useful orientation point, and the site commands a broad view from south around to north-northeast, which would have made it an entirely deliberate choice of location for whoever built it.