In a field at Ballyreehan in north Kerry, a ringfort survives in a state so reduced that most people would walk across it without a second thought. The enclosing bank, once a meaningful boundary of an early medieval farmstead, now measures only about 40 centimetres in height. On the eastern side, it has dissolved almost entirely into a gentle slope that is level with the surrounding ground.

The site is a univallate rath, meaning it was enclosed by a single earthen bank rather than the concentric multiple rings found at more elaborate examples. Its interior is roughly sub-circular, measuring about 17 metres north to south and 18 metres east to west, a modest domestic scale consistent with the kind of enclosed farmstead that was the basic unit of rural life in early medieval Ireland. What remains of the bank is wide, running to around 7 metres, which suggests it was once a more substantial structure before centuries of ploughing and field management wore it down. A later fieldbank, running north to south, has cut directly through the western side of the enclosure, the kind of quiet erasure that happened repeatedly across the Irish landscape as earlier boundaries were absorbed or overwritten by more recent agricultural arrangements. C. Toal documented the site in the North Kerry Archaeological Survey, published in 1995.