At Knockraha in County Cork, a ringfort once occupied a south-facing pastoral slope, a circular earthen enclosure roughly 35 metres across. Today there is nothing to see. The ground has been levelled, the banks absorbed back into the field, and the site persists solely because a surveyor recorded it in 1842 on the Ordnance Survey six-inch map, that extraordinarily detailed early Victorian cartographic project which captured Ireland's landscape at a moment when much of its ancient archaeology was still physically present, if not always understood.

Ringforts, known in Irish as raths when formed from earthen banks and ditches, were the most common form of enclosed farmstead in early medieval Ireland, typically dating from roughly the fifth to the twelfth century. They served as defended homesteads for farming families, the circular bank and ditch providing both practical enclosure for livestock and a degree of social status. Thousands survive across the country in varying states of preservation; many more, like this one at Knockraha, have not. Agricultural improvement, field consolidation, and the general pressure of working land over centuries have erased the surface traces entirely, leaving only the cartographic ghost of a 35-metre circle on a hillside in east Cork.