The site, known as Lisnacarheen or Lios na Ceártan, is a univallate rath, meaning a ringfort defined by a single enclosing bank and ditch, a form of enclosed settlement common in early medieval Ireland. What makes this one quietly interesting is not the outer boundary itself but what lies within it, where low banks of earth and stone radiate inward from the enclosing bank without yielding any obvious explanation of their purpose.

The interior contains a souterrain, an underground passage or chamber typically cut into the subsoil and lined with stone, often interpreted as a place of storage or refuge, as well as traces of possible hut-sites. A substantial rectangular structure has also been identified inside the enclosure, though this is thought to be a later addition rather than part of the original layout. Along the inner edge of the bank at the north-east, a stretch of drystone facing may indicate where those hut-sites once stood, their walls reduced now to little more than a line of carefully placed stones. The site was recorded and described by J. Cuppage in the 1986 Corca Dhuibhne archaeological survey of the Dingle Peninsula, a landmark piece of fieldwork that documented the remarkable concentration of monuments across this part of Kerry.