The site, known in Irish as Lios na Rátha Áirde and recorded under the anglicised form Lisnarahardin, is a bivallate rath, meaning a ringfort enclosed by two concentric banks and ditches rather than the more common single circuit. Ringforts of this kind were typically the enclosed farmsteads of early medieval Ireland, their double defences sometimes indicating higher status or simply a more cautious builder. What makes this example unusual is what sits at its centre: a naturally raised circular mound roughly 20.5 metres across, which was apparently not constructed by human hands at all. Scattered across this natural prominence are stony banks that may represent the footprints of three hut-sites, though only one of them survives in a clearly defined state. The site was also reputedly associated with a souterrain, an underground stone-lined passage typically used for storage or refuge, though no confirmed trace of one has been recorded here. The description comes from J. Cuppage's 1986 archaeological survey of the Corca Dhuibhne region of the Dingle Peninsula, a thorough catalogue of a landscape exceptionally dense with early remains.

What lingers about the place is the layering: whoever chose to settle within this rath did so on ground that was already anomalous, a natural rise inside an artificial boundary, its origins geological rather than social. Whether that mound influenced the choice of location, or was simply built around because it was there, is the kind of question the stony banks cannot answer.