At Pluckanes in County Cork, a ringfort once occupied a roughly circular area of about 45 metres across, its earthen bank enclosing what would have been a farmstead dating to early medieval Ireland. Today, the site has been completely levelled, leaving no visible trace on the ground. What makes it worth noting is that its former existence is known only because a surveyor in 1842 recorded it on the six-inch Ordnance Survey map, marked with the characteristic hachuring used to indicate an earthen enclosure. Without that cartographic snapshot, the site would have passed out of knowledge entirely.

Ringforts, sometimes called raths, were the most common form of rural settlement in early medieval Ireland, typically consisting of a circular area enclosed by one or more earthen banks and ditches. They served as farmsteads rather than fortifications, providing a degree of protection for a family, their livestock, and their stored goods. Thousands survive across the Irish countryside, but many others, like this one at Pluckanes, were gradually removed through centuries of agricultural activity, land clearance, and ploughing. The 1842 OS six-inch map, produced during the first comprehensive survey of Ireland, captured a landscape still carrying many of these features before the pressures of the following decades accelerated their disappearance. This particular example, subcircular in shape and modest in diameter, was already perhaps diminished by the time the surveyors passed through, and at some point after that it was erased from the ground altogether.