The circle measures roughly 6.85 metres by 6.3 metres, and the southern edge of the terrace, raised about half a metre above the surrounding ground, is held in place by large revetment slabs, giving the whole structure an oddly deliberate, almost formal quality for something that has been sitting here for centuries without ceremony.

What makes the site genuinely curious is what lies just outside it. At the base of the terrace, on the southern side, a souterrain opens into the hillside. A souterrain is an underground passage, typically drystone-built, used in early medieval Ireland for storage or as a place of refuge. This one is too narrow to enter now, its opening just 50 centimetres wide and 35 centimetres high, but it leads into a passage running to the north-east, with coursed stone walls that corbel inwards, meaning the side walls lean gradually toward each other overhead until they meet roofing lintels. The combination of a hut circle with an associated souterrain points toward early medieval settlement, when such arrangements were common across the Irish landscape. The antiquarian T. J. Westropp, writing in 1912, recorded a 'fort' on the flank of Cool Hill, and this is likely the same site, though what he called a fort was probably this modest domestic complex rather than anything more imposing.