The earthworks themselves remain largely intact, a roughly thirty-metre-wide circular raised area enclosed by a double ring of banks and an intervening fosse, which is the ditch between the two banks. The inner bank still stands to nearly two metres in places, though its height on the western and northern sides owes something to dumped material added over time. The interior has a gently saucer-shaped profile, the inner face of the bank sloping down towards the centre. The outer bank has been absorbed into the field fence system, which is not unusual for a monument of this kind on productive farmland. Beneath the interior lies a souterrain, an underground stone-lined passage of the kind commonly associated with early medieval ringforts in Ireland, possibly used for storage or refuge.

The place carries an old name that contains its own argument about what it is. Writing in 1934, Bowman recorded that it appeared on the 1841 Ordnance Map as Lisnaheen. The scholar John O'Donovan, working on the same map's accompanying field books in 1841, interpreted this as Lios Naithín, meaning Little Nath's fort, and attributed it to a personal name. An aged local resident, however, called it Lisnahoon, and Bowman considered this the more likely correct form, deriving it from Lios na hUamhain, the Fort of the Cave. Given that a souterrain sits in the interior, the cave interpretation carries some weight. The two readings, one honouring an otherwise unknown figure named Nath, the other describing a structural feature of the site itself, offer a small window into how place-names shift and blur across generations of use.