This is a cashel, a type of stone-walled ringfort characteristic of the Irish early medieval period, and what makes it quietly compelling is not dramatic height or preservation but the density of activity that even its worn condition suggests.

The cashel measures approximately 28 metres on its northeast-southwest axis and 24 metres across, its perimeter defined in different ways on different sides. To the east and south, a grass-covered stone wall and collapsed rubble still stand to a modest external height of around half a metre, with a base width of five metres. Moving southward and westward the wall diminishes further, narrowing to as little as one and a half metres wide, and two animal gaps, later openings cut to allow livestock through, interrupt the southwest circuit. On the west-northwest to east side, the enclosure is defined not by built wall but by a natural or modified scarp, between a quarter and a full metre high, where the limestone pavement drops away steeply. Inside, an L-shaped bank of earth and stone in the southern interior may represent an internal division, an arrangement that hints at separate functional zones within the enclosure, perhaps separating animals from domestic space or dividing a household. A further possible internal division has been identified through aerial imagery. In the northeast sector of the perimeter there is evidence of a possible souterrain, an underground passage or chamber typically associated with early medieval settlement and used variously for storage or refuge. T. J. Westropp noted the site in 1905, and it appeared on Ordnance Survey maps as early as the 1897 twenty-five-inch edition. Approximately forty metres to the west-northwest lies another possible cashel, suggesting this part of Ballyvoe may once have supported more than one enclosed settlement in close proximity, each embedded within a field landscape that predates and outlasts them both.