The enclosure measures roughly 57 metres east to west, and its earthen bank still stands, though it is heavily overgrown. A shallow external fosse, the defensive ditch that once ringed the outside of the bank, remains faintly visible to the north-north-east, though quarrying has disturbed the ground to the north and vegetation has smothered much of the rest.

Ringforts of this kind, known in Irish as raths, were the most common form of rural settlement in early medieval Ireland, typically serving as enclosed farmsteads for a family and their livestock. This one was recorded in 1934 by Bowman, who noted it as a single-ramparted fort within land then belonging to a D. Jones, describing it as oval in shape with axes of approximately 62 and 57 yards. The later measurement of 57 metres east to west broadly accords with that earlier account, suggesting little has changed in the gross outline of the earthwork over the intervening decades. Tucked into the south-west of the rampart is a souterrain, an underground stone-lined passage or chamber of the kind commonly associated with Irish ringforts, where they may have served for storage or as a place of refuge. The combination of ridge-top siting, intact if battered bank, and subsurface structure makes Lismeelcunnin a quietly complete example of a monument type that was once as ordinary as a farmhouse.