It is a confident label for something that, by current reckoning, may no longer be visible at all. No surface trace of the site survives, and what the early mapmakers recorded remains unresolved, possibly the entrance to a souterrain.

A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement in Ireland, used variously for storage, refuge, or ventilation of a dwelling above. Whether that is what lies, or once lay, at Gort Na Cille is uncertain; the classification remains tentative. The location itself is specific enough: the northern end of a northeast-to-southwest ridge, on a small level platform set among extensive rock outcropping, with Kenmare Bay opening out to the south below. It is the kind of position that would have made practical sense for an early community, elevated, sheltered to a degree, and with clear sightlines across the water. The Iveragh Peninsula, on which this site sits, is dense with early medieval and prehistoric remains, so the presence of a souterrain here would not be unusual in itself. What is unusual is that the only evidence for this one is a word on an old map, and nothing on the ground to confirm it.