No bank, no ditch, no perceptible rise in the ground announces it. The only surviving evidence of its existence is a circle drawn on a map made in 1846, when Ordnance Survey cartographers recorded it as a circular enclosure roughly 35 metres across.

A rath, to use the Irish term, is an earthen ringfort, typically a raised circular bank enclosing a domestic settlement, most commonly associated with the early medieval period in Ireland. Thousands of them survive across the country in varying states of preservation, but a significant number have been lost to centuries of farming, ploughing, and land improvement. At Derrynacaheragh, whatever earthworks once defined this enclosure had already been reduced to near-invisibility by the time the six-inch Ordnance Survey map was published in 1846, and today nothing remains at ground level. The site is classed cautiously as a possible rath, a designation that reflects both its likely origins and the uncertainty that comes with any monument known only through cartographic evidence rather than surviving physical form.

What makes the Feabunane slope worth thinking about is precisely this absence. The 1846 map is a record of a thing already half-gone, a shadow of an enclosure that once housed people, animals, and daily life in early medieval Kerry. The pasture that covers it now gives no indication that anything lies beneath.