This one at Coolacoosane, in mid Cork, sits atop a natural rise in pasture land, which is precisely where you would expect an early medieval farming family to have built. A ringfort, or rath, was essentially a circular enclosure of earthen banks and ditches surrounding a homestead, used roughly between the fifth and twelfth centuries. The defended interior offered some protection for people, livestock, and stored goods, and the elevated position here would have extended the view across the surrounding land.

The enclosure is roughly circular, measuring about 21 metres east to west and 20 metres north to south, which is a fairly modest size by the standards of the type. What makes it slightly unusual in construction is that it is not uniform all the way around. From the west-southwest to the north-northeast, the boundary survives as a low earth and stone bank, standing only around 0.4 metres on the interior side. The arc running from the north-northeast back around to the west-southwest is a different matter: here a wide spread of grass-covered rubble is topped by a dry-stone wall, suggesting either a different phase of construction or later repair and reuse of the original material. The entrance, two metres wide, faces toward the east-southeast, an orientation common in Irish ringforts and possibly connected to the direction of the rising sun. Inside the enclosure, cultivation ridges run on a rough north to south axis, the kind of lazy-bed or ridge-and-furrow pattern that points to agricultural use of the interior at some point, whether during the original occupation or in a later period when the enclosure was simply a convenient field boundary.