What you are looking at, were you to stand there, is a rath, the Irish term for a ringfort, which was a roughly circular enclosure defined by earthen banks and ditches, used primarily as a farmstead and place of residence during the early medieval period, roughly between the fifth and twelfth centuries. They are among the most common monument types in Ireland, but familiarity has done little to diminish their quiet strangeness, the sense of a domestic world now almost entirely dissolved back into the land.

The enclosure at Gortacollopa measures approximately twenty-three metres in diameter, a figure that corresponds closely to the roughly twenty metres recorded on the Ordnance Survey six-inch map of 1846, suggesting the feature was already well-established in the landscape by the time that survey was carried out. What remains today is largely the ghost of an earthen bank, about seven metres wide, surviving to an internal height of around ten centimetres and an external height of fifteen centimetres, so low that it might easily be mistaken for a natural undulation in the field. The bank is best preserved along the south-west to north-east arc, with only intermittent traces surviving on the opposite side. The interior slopes gently southward, down toward a view of Macgillycuddy's Reeks, the mountain range that dominates this part of Kerry.

The near-total levelling of the bank is a reminder of how thoroughly such sites can be diminished by centuries of ploughing, grazing, and land improvement, leaving just enough to be mapped and measured but little that announces itself to the casual eye. The 1846 map reference is a useful anchor: it confirms the enclosure was already being recorded at a moment when Irish cartography was becoming systematic, even if the monument itself predates that exercise by perhaps a thousand years or more.