This is a rath, the Irish term for a ringfort, a type of enclosed farmstead built predominantly during the early medieval period, roughly between the fifth and twelfth centuries. Thousands of them survive across Ireland in varying states of repair, and this one at Cloonrane sits towards the more weathered end of that spectrum.

Measuring around 44 metres from east to west, the enclosure is defined by what remains of a scarp, an intervening fosse (a defensive ditch), and an outer bank, the classic layered arrangement that would once have given the site a more pronounced, almost fortified appearance. Time and agricultural activity have softened all of this considerably. A gap on the east-northeast side may represent the original entrance, which, if so, would have opened outward towards the bogland below, a reasonable orientation given that the bog itself offered a degree of natural protection on that side. The elevated position on the knoll is typical of rath placement generally, providing visibility across the surrounding landscape and a degree of natural drainage beneath any timber structures or animal enclosures that once stood within the bank.