On a south-facing slope at Ballinvinny in County Cork, a ringfort once stood in what is now open pasture. A ringfort, or rath, is a circular enclosure typically defined by earthen banks and ditches, used during the early medieval period as a farmstead or place of enclosure for livestock. This one measured roughly 20 metres in diameter, and the only record of its presence on the landscape comes from the 1842 Ordnance Survey six-inch map, where it appears as a clean circular outline. Today there is no visible trace of it at ground level. The field has absorbed it entirely.

This particular site sits within a wider pattern of erasure noted by the historian Power in 1923. Writing about the local Ordnance Memoir records, he observed that no fewer than six ringforts, or lioses, had been documented in the area, but that all but two had by then disappeared. The word "lios" refers to the enclosed space within a ringfort, and it appears frequently in Irish placenames and early historical sources as a marker of settled, bounded land. The fate of these earthworks is not unusual. Across Ireland, ringforts were levelled in their thousands during the eighteenth and nineteenth centuries as agricultural improvement reshaped the land. What makes Ballinvinny worth noting is how clearly the documentary record captures the sequence: the Ordnance Survey mappers saw it, sketched it, and moved on; within a generation or two, the enclosure was gone. A second levelled ringfort lies approximately 240 metres to the south-east, suggesting this was once a more densely settled corner of Cork than the present fields would suggest.