It is easy to mistake for a natural rise in the ground, which is partly why so many of these enclosures have survived. Farmers over the centuries tended to leave them alone, out of practical inconvenience as much as superstition, and so they persist in the landscape long after the settlements they once enclosed have vanished entirely.

This is a rath, the most common type of early medieval ringfort in Ireland, typically constructed between roughly the fifth and twelfth centuries as a defended farmstead for a single family and their livestock. The enclosure at Pluckanes is modest but well-defined: a circular area measuring approximately 24.6 metres north to south and 24.5 metres east to west, ringed by an earthen bank standing to about 1.1 metres in height. The interior surface is uneven, and a waterlogged patch persists along the eastern side of the bank. That unevenness is worth noting; it often reflects the ghost-footprints of internal structures, the sunken floors of timber buildings or the compacted earth around a hearth, long since rotted away but not entirely erased. The waterlogging near the east bank may simply be a consequence of the gentle eastward slope of the surrounding ground, collecting drainage against the inner face of the enclosure.