That pinch in the land, caused by a small inlet cutting in from the north, is precisely where whoever built this place chose to raise a bank of earth, as though they understood that geography itself was doing most of the defensive work. The result is a coastal promontory fort, a type of enclosure common along the Irish Atlantic seaboard in which a headland jutting into the sea is sealed off at its landward end by one or more earthen or stone barriers, effectively turning the promontory into a fortified enclosure with water on most sides.

This particular example sits between two narrow sea inlets, Coosnaskirtane and Coosacunnig, and extends roughly 46 metres to the south-west. Its landward defences consist of two low banks running 15.5 metres across the neck of the promontory, averaging about 65 centimetres in height, though the outer of the two is poorly preserved. The more substantial barrier stands at the natural bottleneck roughly halfway along the promontory, where the bank reaches a maximum height of 1.1 metres. It is a modest construction by any measure, but its logic is clear: a small community or a group needing temporary refuge could hold this thin finger of land against approach from the land with very little in the way of material or labour. The fort was documented by archaeologists Aidan O'Sullivan and Jerry Sheehan in their 1996 survey of the Iveragh Peninsula, published by Cork University Press, though who built it and when remains unrecorded.