The fort at Barrahaurin is one of this quartet, and what makes it worth pausing over is precisely that it is not alone. Ringforts, known in Irish as raths, were enclosed farmsteads typical of the early medieval period, usually defined by one or more earthen banks and ditches and occupied by a single family and their livestock. Finding four of them strung along the same valley edge suggests something more considered, perhaps a pattern of landholding or territorial organisation that has long since dissolved into pasture.

The fort itself is circular, roughly 38 metres in diameter, defined by an earthen bank standing about 1.28 metres high. Parts of the bank are stone-faced, and along its north-eastern and north-western stretches it has been absorbed into the existing field boundary system, the kind of quiet reuse that happens when a landscape is farmed continuously across centuries. There are gaps in the bank to the east and south-south-west, though whether these are original entrances or later breaks is not recorded. Inside the enclosure, there is a possible souterrain, an underground stone-lined passage or chamber that would have served in early medieval times for storage or concealment. The tentative identification is noted but not confirmed.