At Listrim in County Kerry, that curving line is almost all that remains. The enclosure it traces, roughly 25 metres north to south and 28 metres east to west, sits on a slight south-facing slope with open views in every direction, the kind of position that made these sites practical for early medieval farming families who wanted to keep watch over their livestock and land.

Ringforts, known in Irish as raths when they took the form of an earthen bank and ditch, were the dominant settlement type in Ireland during the early medieval period, broadly from around the fifth to the twelfth century. Thousands survive across the country in varying states of preservation, but many, like this one at Listrim, have been partially levelled, their banks spread and reduced by centuries of ploughing, grazing, and field improvement. Here, the eastern to southern arc of the original enclosing bank has disappeared entirely from the surface. What survives is the western to northern curve, absorbed into an existing field boundary and so inadvertently protected. The interior would once have contained timber or wattle structures, perhaps a house, storage buildings, and an animal pen, all long since gone.