The landowner at Kilnafurrery recalls a souterrain on this site, one of those dry-stone underground passages common to early medieval Ireland, used variously for storage, refuge, or concealment, but it has since been infilled and is no longer accessible. Above ground, the rath itself survives as a roughly circular earthwork, measuring just over 35 metres across, its presence announced more by changes in the land's surface than by any dramatic rampart.

A rath is a type of ringfort, the most common archaeological monument in Ireland, typically dating from the early medieval period between roughly 500 and 1000 AD. They served as enclosed farmsteads, the earthen bank and ditch providing a boundary for a household and its livestock rather than any serious military defence. At Kilnafurrery, the enclosing feature is a scarp rather than a built-up bank, meaning the ground has been cut and shaped rather than heaped. The eastern side, which faces downslope, retains the most height at around two metres, while the remainder stands closer to one metre. Very faint traces of a fosse, the external ditch that would originally have accompanied the earthwork, are still just about legible in the ground. The site sits in pasture on a break in slope, roughly 150 metres from a stream to the east, a quietly practical position of the sort that early medieval farmers consistently favoured, with water nearby and a natural gradient to assist drainage and visibility.

The infilled souterrain adds a particular layer of interest here. These underground structures were carefully built, often running for several metres, and their deliberate closure, even in relatively recent memory, is a reminder of how much has been quietly absorbed back into the working landscape of rural Ireland without ceremony or record.