The rath at Rathcool in north Cork is more elusive than most. What survives above ground amounts to a low interior rise of about half a metre on one side and a slight exterior swell of thirty centimetres on the other, the ghost of a single encircling bank that has been almost entirely levelled. A natural scarp to the south appears to have been absorbed into the structure's layout, with the original builders making use of the existing topography rather than working against it.

A ringfort, sometimes called a rath, was typically a circular enclosure defined by one or more earthen banks, used as a farmstead during the early medieval period in Ireland. This example at Rathcool sits in pasture on a natural rise at the western side of the Owenbaun River, occupying the kind of slightly elevated position that early farmers favoured for both drainage and visibility. Its outline, a circular enclosure of roughly fifty metres in diameter, was still clear enough in 1842 to be recorded on the Ordnance Survey six-inch map of that year as a hachured circle, the conventional marking for earthworks. By 1934, when Bowman noted it in print, it was already being described as levelled, one of two such single-ramparted forts on land then belonging to a Mr McCarthy. The second fort, a separate but related site, appears to have met much the same fate.

The site sits in working farmland, and with so little remaining above ground there is little to guide the eye without some prior knowledge of exactly what to look for and where. The value here is less in what can be seen than in what the cartographic record preserves, a circular impression on a mid-nineteenth-century map that marks out a place people chose, farmed, and enclosed more than a thousand years before anyone thought to draw it down.