This is a rath, a type of ringfort common across early medieval Ireland, in which a family or small farming community would have lived within a circular enclosure defined by an earthen bank and, often, an outer ditch. Thousands survive across the island in varying states of repair, and the one at Cartown is neither the grandest nor the most dramatic, but it has a quiet persistence about it that rewards attention.

The enclosure measures roughly 31 metres north to south and 34 metres east to west, making it a modest but complete example of the form. The earthen bank that defines it still stands to an internal height of around 0.6 metres on its better-preserved sections, with the exterior face reaching approximately 0.75 metres where it has been left undisturbed. The southeast to southwest arc of the bank is in the best condition, while the northern stretch has been noticeably worn down, to around 0.25 metres on the exterior, by the movement of cattle across it over what may be centuries of agricultural use. The site sits just below the brow of a low hill on a north-facing slope, a position that would have offered some natural advantage in terms of visibility and drainage. A number of mature deciduous trees have taken root on the bank itself, which is otherwise clear of heavy overgrowth. The details were compiled by Denis Power and the record uploaded in August 2011, with an aerial photograph taken in March 2006 confirming the circular outline from above.

The interior of the ringfort is level and under pasture, meaning it sits within a working agricultural landscape rather than any kind of managed heritage setting. There are no signs or formal access points noted, and visitors approaching across farmland should bear that in mind and seek landowner permission before entering. The bank is most legible when the grass is low, so late winter or early spring, before growth obscures the subtle changes in elevation, offers the clearest reading of the shape. The trees on the bank make for useful landmarks when trying to trace the circuit, and the southeastern arc, being the most intact, gives the best sense of the original scale and intention of the structure.