The one at Ballyreehan in north Kerry follows that pattern, mostly, but carries inside it something that does not quite fit. Tucked into the northern sector of the enclosure is a separate mound, roughly four metres across north to south and six metres east to west, that curves inward against the bank rather than sitting free in open ground. That kind of internal feature is not standard, and it raises the question of whether it represents an earlier structure absorbed into the rath, a deliberate addition to it, or something else entirely.

A rath, to be clear about the term, is an enclosed farmstead of roughly the fifth to twelfth centuries, defined by one or more earthen banks and typically housing a family of some social standing. A univallate rath has just the single enclosing bank, as here. The Ballyreehan example sits in low-lying pastureland and offers clear sightlines in every direction, which would have been a practical advantage for whoever built and occupied it. The rath and its interior mound were recorded as part of the North Kerry Archaeological Survey, published in 1995 by Catherine Toal in association with the FÁS Training and Employment Authority. That survey remains one of the more systematic efforts to catalogue the dense scatter of earthworks across this part of the county, and the Ballyreehan site appears as entry number 619 within it.