At Ardconnell, a roughly circular enclosure of earth and stone encloses a space nearly 42 metres across, and within it, close to a natural outcrop of rock in the north-western interior, there is what appears to be the entrance to a souterrain, a type of underground passage built in early medieval Ireland, typically from drystone walling, and used for storage, refuge, or both. The tunnel walls are of dry-laid stone, and from what can be determined the passage runs northward to north-east beneath the ground. It is an understated detail in an already understated landscape, but it hints at the organised, layered domestic life that once went on inside this enclosure.

The site is a univallate rath, meaning it has a single enclosing bank rather than the two or three concentric rings found at more elaborate examples. A rath is the earthwork form of a ringfort, the most common monument type surviving in the Irish countryside, built and occupied from roughly the early centuries of the first millennium into the early medieval period. This one at Ardconnell is sub-circular in plan and retains its bank across much of its circuit, where it measures around 5 metres wide at the base and stands up to 1.8 metres above the external ground level. The interior sits slightly higher than the surrounding land, which is typical of sites where centuries of occupation and accumulated material have raised the floor. The north-to-west portion of the bank has been levelled, and a fieldbank cuts across the southern to western arc, the ordinary pressures of agricultural land-use slowly reshaping what survives. Embedded in the eastern stretch of the enclosing bank is a single stone upright, roughly 0.7 metres tall and 0.4 metres wide, its original purpose unrecorded. Three separate depressions are visible across the interior, each several metres across, suggesting subsurface features that have not been formally excavated.