The rath at Ballea in County Cork is a little more complicated than that. Tucked into pasture on the south-facing slope of an east-west ridge, it carries the marks of at least two distinct phases of human use, one prehistoric or early medieval, and one considerably more industrial.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically defined by one or more earthen banks and a surrounding ditch. At Ballea, the arrangement is notably substantial. A low inner bank, standing only about half a metre on the interior, gives way to a fosse, a defensive ditch, roughly 1.8 metres deep, and then to a hefty outer bank that reaches 3.2 metres at its highest external face. Between the two banks, a flat berm, or terrace, about four metres wide, runs along the inner face of the outer bank. The interior of the enclosure is saucer-shaped, sloping gently inward, with the main entrance to the south where a causeway carries the old approach across the fosse. There is also a break in the outer bank to the north-north-west, possibly a secondary opening, possibly something older. What sets this site apart from the typical rath, however, is what happened to the western stretch of its outer bank at some later point. Someone modified it to incorporate a lime kiln, a structure used for burning limestone to produce quicklime for agriculture or construction. The kiln, recorded separately in the Cork monument record, is built directly into the prehistoric earthwork, using the bank's mass as part of its fabric. It is a quietly telling detail: the old enclosure repurposed, its defensive geometry subordinated to the practical needs of a later farming economy.