Look more carefully and the geometry becomes apparent: a roughly circular enclosure, thirty metres across in both directions, defined by an earthen bank that still stands some 1.6 metres high on its interior face. This is a rath, the most common monument type in the Irish landscape, built during the early medieval period as a defended farmstead or enclosed settlement. Thousands survive across the country in varying states of preservation, and this one is a reasonably legible example of what the form looks like when it has been left alone, more or less, by subsequent centuries of farming.

The bank retains traces of stone facing, particularly along its northern arc from north-north-west around to north-north-east, where the structure survives best. A shallow fosse, a defensive ditch dug to complement the bank, runs along the northern and north-western sides, though it is only about 0.4 metres deep now, reduced by centuries of silting and weathering. Two breaks in the bank, one to the north-east and one to the south-west, are connected by a trackway that crosses the interior, suggesting these were functional entrances rather than later damage. Less tidily, the south-eastern quadrant tells a story of more recent agricultural use: field clearance material has been piled against the outer face of the bank on that side, and rubble and loose stone have been dumped inside the enclosure in the same quarter. It is the kind of casual accumulation that happens when a monument stops being understood as a monument and becomes simply a convenient corner of a field.