This is Cahernacummeen, or Cathair an Choimín, a cashel, meaning a stone-walled ringfort of the kind built extensively across early medieval Ireland, typically as an enclosed farmstead for a single family or small community. What makes this one worth attention is less any grand survival and more the density of domestic detail still readable within its roughly twenty-metre interior, even in its ruinous state.

The enclosing wall, some 2.2 metres thick, retains what may be its original entrance on the ENE side, where two stones are set 1.66 metres apart across the full wall thickness. A rectangular depression cut into the wall on the north side, drystone-lined and measuring roughly 1.75 metres by 1 metre internally, remains unexplained; its date and function have not been established. Inside the cashel, at least two hut foundations survive. One, D-shaped in plan, is pressed against the inner face of the enclosing wall at the northeast, its walls now reduced to little more than low upright stones forming the base of its inner face. The other, roughly oval and located toward the western part of the interior, is better preserved, with drystone walling still standing to a maximum of 0.7 metres, and small niches set into its inner face at north and west. Against the western section of the cashel wall, someone also built a small secondary enclosure using rough, irregularly coursed stonework, creating a space approximately 2.7 metres by 1.3 metres; its purpose, like that of the rectangular wall depression, is not recorded. The site was documented by J. Cuppage in the 1986 Dingle Peninsula archaeological survey.