What survives is not stone or earthwork but cartographic memory: the 1842 Ordnance Survey six-inch map shows the enclosure still partly standing to its west and north, and by 1902 a hachured arc, the map-maker's shorthand for a sloping or raised edge, traced the same western-to-northern curve. After that, nothing. The site is now fully levelled, with no visible surface trace remaining.

Ringforts, sometimes called raths, are roughly circular or oval enclosures defined by one or more earthen banks and ditches. They were built predominantly during the early medieval period, between roughly the fifth and twelfth centuries, and served as enclosed farmsteads for individual families or small kin groups. This particular example at Coolbane was possibly subrectangular rather than the more common circular form, which is itself a minor curiosity; most raths are noticeably round, and a subrectangular outline can sometimes indicate an earlier or more unusual construction. Within sixty metres to the east, a second ringfort, recorded separately, still exists. That proximity suggests the landscape here was once actively settled, with two enclosures in close relation, though what that relationship meant in practice, whether contemporary occupation, family grouping, or successive phases of use, the evidence no longer allows us to say.

There is nothing to see at the Coolbane site itself. Its interest is entirely retrospective: a structure that survived long enough to be mapped twice, eroded enough between those two surveys to leave only a partial arc, and then vanished entirely. The nearby ringfort to the east at least offers earthwork still present in the ground, and for anyone curious about the density of early medieval settlement in this part of Cork, the pairing of the two sites, one surviving, one gone, is a quiet illustration of how much has been lost from the visible landscape without disappearing from the record.