This is a rath, the Irish term for a ringfort, the kind of enclosed farmstead that once dotted the early medieval landscape in extraordinary numbers, and this one has held its shape with unusual clarity.

The enclosing bank at Lacka More is built from earth and stone and measures on average seven metres wide at the base, rising two metres above the interior and a more considerable 2.6 metres above the external fosse, the term for the ditch that runs around the outside. That fosse follows a U-shaped course, wrapping around most of the site but leaving the eastern to south-eastern arc unexcavated. Where it does survive, it averages 1.7 metres wide and 1.1 metres deep. The site is described as univallate, meaning it has a single enclosing bank rather than two or three concentric ones, which was the most common arrangement for a ringfort of this type. A gap of three metres on the eastern side served as the original entrance, and the interior, measuring roughly 35 metres across in each direction, would once have contained a household, its outbuildings, and whatever small world a family of early medieval Ireland needed to sustain itself. The dimensions and construction details were recorded in the North Kerry Archaeological Survey, compiled by C. Toal and published in 1995.