It measures 7.2 metres across in both directions and is enclosed by a low earthen bank no more than 0.7 metres high, barely knee-height, the kind of subtle ridge in the ground that reads as a field boundary or a trick of the terrain unless you know what you are looking at. A possible entrance opens at the south-east, and the interior slopes gently downward in the same direction, its surface now scattered with dumped field clearance stones accumulated over generations of farming.

What lies beneath that unremarkable grass is almost certainly a ring barrow, a prehistoric funerary monument in which a burial, or burials, would have been placed within a defined circular space and demarcated by an enclosing bank. Ring barrows are generally associated with the Bronze Age, roughly 2500 to 500 BC, though their precise dates vary considerably from site to site. The monument at Kilgarriff sits at a break in the hillslope, a position that may have been deliberately chosen for its visibility across the landscape, or for its symbolic position between elevations. The accumulation of clearance stones inside the enclosure is a common story at sites like this across Ireland, land that was venerated in one era quietly pressed into agricultural use in another, the monument surviving not through any special protection but simply because the bank made the interior awkward to plough.