What gives it away is the geometry: a rough but deliberate curve of flags and boulders, roughly seventy metres across at its widest point, with the eastern edge formed not by human hands but by natural rock outcrop, as though whoever built the enclosure decided the geology had already done half the work.

The walls themselves are described as denuded, meaning they have been reduced over time, likely through weathering, robbing of stone for other uses, or simple neglect, to low, sod-covered ridges that preserve the outline without retaining much of the original height or character. The interior undulates, suggesting the ground beneath has its own story, though no identifiable archaeological features have been recorded within it. Whether it served as a field boundary, an enclosure for livestock, or something with an earlier and less functional purpose is not established. The island, Inis Mhic Aoibhleáin, is one of the smaller islands in the Kerry group, and the enclosure sits within a landscape where the boundary between built and natural has long since blurred.