It sits on the western end of a glacial ridge, the kind of long, gravelly spine left behind by retreating ice sheets, and from the surrounding grassland its presence is easy to miss.

What survives is a subcircular enclosure measuring roughly 40 metres north to south and just under 34 metres east to west. Enclosures of this general type, which may have served as farmsteads, ceremonial spaces, or places of shelter depending on their period and context, were once common features of the Irish landscape. At Knocknaboley, the road has effectively divided the site into two unequal experiences. On the eastern side, a bank still stands above ground level. On the western side, only a scarp, a low earthen edge or slope, marks the boundary of what was once the perimeter. Within the eastern half of the interior, an irregular mound and two depressions survive, though what these features represent, storage, structural remains, or later disturbance, is not recorded. The monument is described as very poorly preserved, and that assessment is hard to argue with, given that modern infrastructure has cut directly across it.