This port-hole, cut neatly into a single end-slab at ground level and measuring just 48 centimetres wide by 33 centimetres high, is the only way into a chamber beyond, which is now flooded and silent. The cashel, a term for a stone-walled ringfort, sits on the headland forming the western side of the entrance to Smerwick Harbour on the Dingle Peninsula, its circular outline about 32 metres in diameter. Much of what once made it legible as a monument has been absorbed into the surrounding landscape: straight field walls have replaced the original enclosure on its eastern and southern sides, and where a wall some 2.4 metres thick once stood, there is now little more than a difference in ground level.

An earlier description in the Ordnance Survey Name Books recorded it as a circular fort composed chiefly of stone, and a surveyor named Curran noted the enclosing wall as almost completely destroyed by his time. What the interior still holds, though, is quietly puzzling. A turf-covered ridge of earth and stones runs north to south for 27 metres through the western half of the enclosure, and along its top sit features whose purpose has not been resolved: prostrate slabs, a stone-filled pit, two stones set on edge, and shallow depressions in the ground. Curran recorded two structures in the interior, likely the footprints of round huts roughly 4 metres and 2.7 metres in diameter, though these do not appear to correspond to the depressions currently visible. The souterrain, a type of underground stone-built passage associated with early medieval settlement and sometimes used for storage or refuge, extends from a point several metres inside the western scarp, branching at a right angle into a second passage whose full length could not be determined. Collapsed roofing slabs block part of it, and the flooded terminal chamber may connect to further passages not yet documented. A piece of pottery was found somewhere in the complex, noted by O'Sullivan in 1931. On the surface nearby, an unfinished quernstone, a rotary grinding stone used for milling grain, still lies where it was left. Curran had noted a second unfinished example, and the landowner at the time of survey recalled two more with complete perforations that had gone missing from the site about ten years before the 1986 Dingle Peninsula archaeological survey recorded all of this.