It is not a fort at all, but a ring barrow, a type of funerary earthwork in which a central mound is encircled by a fosse, or ditch, and an outer bank of earth. The misidentification is a common fate for such monuments; their circular forms can look, at a glance, like the remnants of a defensive enclosure, and cartographers over the centuries have not always distinguished between the two.

The place-name embedded in that map label carries its own quiet interest. Cill Bhreacáin translates roughly as "the church of Breacán", Breacán being a personal name associated with an early Irish saint. There is no church here now, and it is unclear whether one ever stood nearby, but the attachment of a saint's name to a much older pagan monument is a pattern that repeats across Ireland, where early Christian communities often folded pre-existing sacred or ceremonial sites into their own geography. The barrow itself is a modest structure: a low, roughly circular central mound measuring approximately 17 metres across, enclosed by a fosse between three and five metres wide, and beyond that an outer earthen bank. The whole monument extends to around 39 metres across. Within the interior, several smaller mounds are visible, and one of these yielded burnt earth and stones when examined, a detail consistent with cremation burial practices associated with Bronze Age ring barrows.