The one at Ballyandrew in north Cork is a good example of that gradual erasure, though it has not entirely disappeared. Now under tillage, the site retains just enough of its original form to reward close attention: a low arc of rising ground running from the north-north-east to the east-south-east, and a segment of earthen bank that has been absorbed into the modern field fence to the south. A slight depression to the west and north-west likely follows the line of the fosse, the defensive ditch that would have ringed the enclosure's outer edge.

Ringforts, sometimes called raths, were the most common form of rural settlement in early medieval Ireland, typically enclosing a farmstead within one or more banks and ditches. The Ballyandrew example was a modest one, with a diameter of around 30 metres. It appears on the Ordnance Survey six-inch maps of 1842 and 1937 as a hachured circular enclosure, the standard cartographic shorthand for an earthwork, though by 1905 the same surveyors were already recording it as a depression rather than a standing feature, suggesting it had been largely levelled by then. Aerial photography has since revealed more than ground inspection alone could show: a cropmark, visible because crops grow differently over buried soil disturbance, outlines both the bank and an external fosse. That same image suggests a causewayed entrance to the north-west and hints at a narrow second fosse, which would point to the site having had a second bank at some point, making it a bivallate fort. A second circular enclosure sits roughly 50 metres to the north-west, indicating this was once a landscape with more than one such feature in relatively close proximity.