Most of Ireland's estimated forty to fifty thousand raths were built on gently rising ground, commanding a view while remaining defensible; this one at Teernaboul sits on the edge of a sharp drop down to the Woodford River valley, its eastern side already half-swallowed by a modern field boundary. What survives is noticeably asymmetrical: the southern and western arcs are marked by a low scarp rather than a raised bank, while the northern arc still carries a grass-covered bank nearly a metre high on its outer face. The interior slopes gently eastward, as if tilting towards the valley below.

A rath is a ringfort of earthen construction, typically dating from the early medieval period, roughly 500 to 1000 AD, and used as a farmstead enclosed by one or more banks and ditches. Here, darker soil detected at the base of the scarp hints at the former presence of a fosse, the external ditch that would originally have reinforced the enclosure. The site's outline appears on the 1846 Ordnance Survey six-inch map as a circular enclosure roughly thirty metres across, a reasonably clear impression of the structure at that point. By the 1893 to 1894 revision, the same map records it as a circular raised area of about twenty-five metres, with the eastern arc already absorbed into the surrounding field system, a change that reflects the gradual, undramatic way that agricultural reorganisation in the post-Famine decades eroded earthworks that had persisted for a thousand years. Roughly one hundred and fifty metres to the north-west, two pits of uncertain date or function add a further layer of complexity to what might otherwise appear a straightforward pastoral landscape.