It is a rath, the Irish term for a ringfort, the most common type of early medieval enclosure in Ireland. Thousands were built across the country, typically between the sixth and tenth centuries, serving as the fortified farmsteads of farming families of middling status. Most people drive past them without a second glance, reading them as odd lumps in a field.

This particular example measures roughly 41.8 metres north to south and 42.6 metres east to west, enclosed by an earthen bank standing 1.65 metres high. Outside the bank runs a fosse, a defensive ditch, cut to a depth of 2.1 metres, which remains waterlogged to the west. That persistent waterlogging is a small but telling detail, suggesting the natural drainage of the slope still feeds the ditch much as it would have done when the enclosure was first dug. A gap of 3.4 metres in the western bank marks what was likely the original entrance, wide enough for a person and livestock to pass through, oriented towards the lower, wetter ground rather than the more exposed upper slope.