The site at Cloonanna carries the designation "cashel", a term used in Irish archaeology to describe a ringfort whose enclosing boundary is built primarily of stone, distinguishing it from the more common earthen rath. This one sits on a gentle west-facing slope, its roughly circular interior measuring approximately thirty metres across, the whole thing still legible in the landscape despite the centuries that have passed since anyone last lived within it.

The enclosing bank, surveyed and recorded by Martin Fitzpatrick with notes uploaded in June 2020, tells a slightly mixed constructional story. Along the north-east through to the south-east arc, the inner face of the bank is lined with stone revetment, meaning carefully placed upright or coursed stone used to hold the bank material in position. Elsewhere around the circuit, the bank shifts to rubble with an earthen core, suggesting either phased construction, later repair, or simply pragmatic use of whatever material was to hand. The bank itself is modest in scale, standing roughly 0.3 metres on the interior and 0.4 metres on the exterior, with a base width of about 3.7 metres. A gap of just under two metres on the north-west side is interpreted as a livestock entrance, which is consistent with the long post-medieval history of such monuments being absorbed into working farmland long after their original domestic function had ended. Ringforts of this kind were typically built and occupied during the early medieval period, roughly the fifth to twelfth centuries, and served as enclosed farmsteads for a single family or small community.

The site sits in pasture and is most clearly readable from aerial imagery; the outline of the tree-covered monument is visible on Google Earth orthoimages from both 2004 and 2020, which gives a useful sense of its footprint before any ground visit. On the ground, the bank is low and could easily be missed without prior knowledge of what to look for. The level interior and the surviving arc of stone revetment along the eastern side are the details most worth seeking out. As with many such monuments in the Irish midlands and west, the trees growing on and around the bank are themselves a marker of the site's status as undisturbed ground, since local tradition has long associated ringforts with the otherworld and discouraged their clearance or cultivation.