The bank of this ringfort, roughly 4.5 metres wide and still standing up to 1.8 metres above the surrounding ground, has been punctured and weakened in places by burrows, giving one of Ireland's most ancient settlement forms an unexpectedly domestic adversary.

A rath, the Irish term for a ringfort of this type, was the standard farmstead of early medieval Ireland, typically occupied between roughly the fifth and twelfth centuries. A univallate rath, meaning one enclosed by a single bank and ditch rather than multiple concentric rings, was the most common variety, home to a farming family and their livestock. This example in Aghabeg is modest in scale, its interior measuring approximately twenty metres across, and is described in C. Toal's North Kerry Archaeological Survey, published in 1995 through Brandon Press in association with FÁS. The interior today sits at roughly the same level as the surrounding land, which suggests the ditch material was thrown inward over time or that the original surface has survived relatively undisturbed beneath the growth. What covers it now is anything but tidy: a dense tangle of tree trunks, brambles, and branches has taken hold, making the interior largely inaccessible and giving the whole enclosure the appearance of a deliberate thicket rather than a human construction.