The one at Boulteen in County Cork is easy to overlook in exactly that way, sitting quietly in pasture on a south-west-facing slope. What makes it worth pausing over is a small act of practical engineering embedded in its construction: the interior has been deliberately raised on the south-west side to compensate for the natural incline of the hill, creating a level living platform inside what would otherwise be a tilted enclosure.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically dating from somewhere between the fifth and twelfth centuries. The enclosure itself is defined by an earthen bank, the kind built up from material dug out of an accompanying ditch. At Boulteen, the bank survives to an internal height of around 1.2 metres on the western to eastern arc, while the southern to western stretch presents as a scarp of the same height. The eastern to southern section is considerably more subdued, only around 0.25 metres above the interior. The overall shape is roughly circular, measuring approximately 35.5 metres north to south and 34 metres east to west. These are not dramatic dimensions, but they are consistent with a single-family enclosure of the period, the sort of place where a household would have kept livestock safe overnight and gone about the ordinary business of an early Irish farming life. The quiet effort taken to level the interior against the gradient of the slope suggests a degree of care and intention that is easy to miss when you are simply looking at a grassy bank in a field.