The ringfort at Ballyreehan in north Kerry is not a dramatic earthwork rising from the landscape but rather the ghost of one, a site so thoroughly levelled that what remains takes some reading. Ringforts, known in Irish as raths, were the enclosed farmsteads of early medieval Ireland, typically circular areas defined by one or more earthen banks and their accompanying ditches. Most were built and occupied between roughly the fifth and twelfth centuries. This one belongs to that broad tradition but now barely announces itself above the field.

The site is sub-circular in plan, measuring roughly 24 metres north to south and 21 metres east to west. It is univallate, meaning it had a single enclosing bank rather than the multiple concentric rings seen at higher-status sites. That bank, once a defining feature, has been reduced to a low, wide earthen ridge, approximately five metres across and only half a metre high. A fieldbank that formerly ran along the western side has been levelled entirely. What makes the place slightly more interesting than a simple ring of disturbed soil is an anomalous raised area on the interior. Curving inward from the western bank toward the centre and then bending northwest, it measures roughly 13.4 metres by 8.6 metres and stands about 0.3 metres above the surrounding ground. Its function is not recorded, though such interior features occasionally represent the footprint of a collapsed structure or an earlier phase of use. The site sits in the same field as a second recorded monument to its northwest, suggesting this corner of Ballyreehan was a place of some sustained activity in the early medieval period.