It is not dramatic to look at, and that is rather the point. This is a rath, the Irish term for a ringfort, the most common type of early medieval settlement in Ireland. Farmers, not warriors, built these enclosures, typically between the sixth and tenth centuries, using them to protect a household and its livestock within a raised earthen bank and a surrounding ditch. The fact that this one survives at all, worn and overgrown as it is, is quietly remarkable.

The site at Dooncaha was recorded and compiled by Denis Power, with notes uploaded in August 2011. The enclosure is oval in plan, measuring roughly 31 metres north to south and 36 metres east to west. A raised earthen bank defines most of the perimeter, standing to an internal height of around 0.9 metres and an external height of 1.5 metres, the difference reflecting the way earth was thrown inward during construction. On the outer side, running from the west-north-west around to the north-east, a fosse accompanies the bank; a fosse is simply a cut ditch, and here it measures about 2 metres wide and 0.3 metres deep, modest by some standards but still traceable. From the north-east around to the west-north-west, the enclosure is completed not by a surviving earthen bank but by a field boundary of earthen construction, which straightens into a linear form as it runs south-south-west to west-north-west. A gap of about 2.5 metres in the bank at the north-north-east may mark the original entrance, or simply a point of later erosion. Cattle have worn the bank down on the west-north-west side, where they have been accessing the interior over time.

The interior slopes gently down toward the north-north-east and is under rough pasture, so there is nothing formally arranged to find underfoot. The bank itself is heavily masked by vegetation, which means that from a distance the site can read more as a scrubby rise than a defined enclosure. The most informative approach is to walk the perimeter carefully, noting where the fosse becomes visible and where the field boundary takes over from the earthen bank. Early morning or late afternoon light, when shadows are long, tends to bring earthworks like this into better relief.