The earthen bank that defines it is still measurable: roughly 28.5 metres in diameter, standing about 1.1 metres above the interior ground level and 1.4 metres above the exterior, which gives a sense of how much presence these structures retain even after more than a thousand years of agricultural use.

Ringforts, known in Irish as raths when formed from earthwork rather than stone, were the dominant settlement type in Ireland from roughly the early centuries AD through to the end of the first millennium. They were not primarily military fortifications but enclosed farmsteads, the bank and any accompanying ditch providing security for livestock and a degree of social definition for the family within. What makes the Kilcullen example quietly interesting is the possible souterrain in its interior. A souterrain is an underground passage or chamber, typically stone-lined, that was used for storage, refuge, or both. Their association with ringforts is well established across Munster and beyond, though confirming their presence without excavation is often difficult, which is why the attribution here remains tentative.

The site sits in pasture with a north-easterly outlook over the Dripsey River valley, a setting that would have made practical sense to whoever chose it: water nearby, elevated enough for visibility, and ground that could support both crops and animals.