The site at Knockaunavaddreen is a rath, the Irish term for a ringfort, which was a type of enclosed farmstead typically constructed during the early medieval period, roughly between the fifth and twelfth centuries. These circular enclosures, defined by earthen banks and ditches, were the dominant settlement form across early medieval Ireland, and tens of thousands once dotted the landscape. Most have been reduced to the faintest of traces. This one survives as a slightly raised circular area, its boundary no longer a proud bank but a gentle scarp, the kind of thing you might walk across without registering what lies beneath your feet.

The enclosure measures approximately 35.5 metres north to south and 35 metres east to west, making it a fairly typical example of the form. It was already being recorded cartographically in the nineteenth century; the 1842 Ordnance Survey six-inch map shows it as a hachured circular enclosure, a standard convention of the period for depicting earthworks, sitting on the north side of a roadway on a gentle east-facing slope. What makes this particular site quietly interesting is a feature running through its interior. A possible entrance faces east, which was a common orientation for ringfort openings, and from that entrance a remnant linear bank extends inward, crossing the interior for roughly twenty metres in a south-westerly direction. Internal banks of this kind are less commonly noted and may reflect later subdivision, a change in use, or simply the afterlife of the enclosure in agricultural contexts long after its original inhabitants were gone.