This is an enclosure, the kind of feature that appears with some regularity across Ireland's farmland, usually interpreted as the remains of a ringfort or similar early medieval settlement. What makes this particular example quietly interesting is the unevenness of its survival: approach from the north-east and the defining scarp rises to around 2.3 metres, a genuinely substantial earthwork edge; approach from the south and it almost disappears entirely, folded so seamlessly into a field boundary that the two are now functionally one.

Enclosures of this type are broadly understood as the enclosed farmsteads of early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries, though many were likely in use for far longer. They were built by digging a circular ditch and throwing the spoil inward to create a raised interior platform, sometimes reinforced with a bank, sometimes not. The scarp at Cloonacurry, the steep face left when the surrounding land was cut away or the interior raised, is the surviving trace of that original effort. That it has been incorporated into a field boundary from the south to the south-west is entirely typical of how such sites persist in an agricultural landscape; farmers working land across many centuries have found it practical to co-opt ancient earthworks rather than level them entirely, with the result that the enclosure and the field system have grown together into something that reads, from certain angles, as simply ordinary ground.