The one at Killehenny in north Kerry does something slightly different. Sometime after it was built, a ridge of earth running east to west was thrown up across its interior, dividing what had been a unified enclosed area into two distinct zones. Whether that ridge represents a deliberate subdivision of the space or simply the slow accumulation of an old field boundary pressing in from outside is not entirely clear, but its presence gives the site an layered quality that most of its counterparts lack.

The rath, as this type of single-banked ringfort is properly called, measures 32 metres in internal diameter, placing it comfortably within the range typical of early medieval enclosed farmsteads in Ireland, structures generally associated with the period between roughly the sixth and twelfth centuries. Its enclosing bank is around seven metres wide and about half a metre high, which is modest, though the northern section has sunk further still and now reads only as a barely perceptible rise in the surrounding pasture. What is less typical is the number of openings: three gaps, each around four metres wide, face east, south, and west respectively. Most raths have a single entrance, so the presence of three, if all original, is worth pausing over. The site sits in low-lying pastoral land in north Kerry, a landscape that has been farmed continuously since well before this enclosure was built.