Early Ordnance Survey mapmakers recorded it simply as a subcircular field, which gives some sense of how thoroughly its original character had already blurred into the landscape by the nineteenth century. From the knoll, there is a long open view westward along the valley, and that commanding position may well have been part of the point.

The enclosure measures roughly 11.4 metres north to south and 14.3 metres east to west. Its wall, built from a rubble core faced on both sides with coursed drystone masonry, still stands 1.3 metres high on the southern side, though it drops about 0.6 metres on the interior face. Some upright slabs and slabs set on edge reinforce the external wall-face, and a 1.4-metre gap in the western wall most likely marks the original entrance. More intriguing is a lintel-like slab exposed by badger activity at the north-west, which may indicate the presence of a souterrain, an underground stone-lined passage typically associated with early medieval settlement sites, used for storage or as a place of refuge. Several walls of similar construction radiate outward from the enclosure's exterior face and appear to have been built at the same time as the main structure, suggesting this was once the nucleus of a small agricultural complex rather than a simple boundary.

The site sits within the Iveragh Peninsula, one of the more archaeologically layered landscapes in Ireland, and the enclosure at Meall na Mbreac offers a quietly instructive example of how much can survive in a worn and burrowed ruin. The cultivation ridges inside, the careful masonry just visible beneath the disturbance, and the radiating field walls together trace the outline of a working place whose builders and dates remain uncertain.