The earthwork itself is a univallate rath, meaning a roughly circular enclosure defended by a single earthen bank and ditch, the kind built across Ireland during the early medieval period, typically as a farmstead or small defended settlement. What sets this particular one apart is what lies, or lay, beneath it: a souterrain, an artificial underground passage or chamber, usually stone-lined, that served as a place of refuge, storage, or concealment in times of danger.

The rath sits near the crest of a low, gently level ridge at around 212 feet above sea level, a position that separates the lower reaches of the Owenmore and Scorid rivers in the area known as Cill Mhuire in County Kerry. The underground chamber was recorded by a researcher named Curran, and the site was later catalogued in J. Cuppage's 1986 archaeological survey of the Corca Dhuibhne region, the Dingle Peninsula. Souterrains associated with raths are found throughout Ireland, but the combination here, a ridge-top enclosure with a subterranean feature tucked beneath it, speaks to the careful, layered way early medieval communities used the landscape, placing their homes and their secrets in positions that offered both outlook and concealment.