A cashel is a stone-walled ringfort, and this one has been worn low enough that it now reads mostly as a grassed-over spread of rubble, its original shape legible only if you know to look for it. What gives it away are the sporadic facing-stones still visible along the inner and outer edges of the wall spread, and two large boulders at the south-east of the circuit that likely mark where an entrance once stood, roughly 1.8 metres wide.

The enclosure is substantial despite its battered condition, measuring about 35.6 metres east to west and 30 metres north to south internally, which suggests it was once a significant structure in this coastal landscape. It appears on the Ordnance Survey six-inch maps of both 1842 and 1915 under the name Gortagreenan Fort, and the antiquarian Thomas Johnson Westropp noted it in 1911, recording it as Gortagreenaun Fort. Its Irish name, Gort an Ghrianáin, given on Tim Robinson's 1977 map of the Burren area, translates roughly as the field or enclosure of the sunny bower or solarium, a name that hints at how the site's warm southern aspect may have shaped how people understood and used it over centuries. A later field wall has since been built across the north-west to south-south-west section of the site, overlying the older structure and making the reading of the original plan a little harder.