Roughly circular and measuring around 33 metres north to south and 35 metres east to west, the enclosing bank of this rath sits squat and broad, up to ten metres wide at its base and rising just 1.4 metres above the surrounding land. That modest profile is partly a consequence of time and agricultural pressure; the earthwork has been considerably levelled over the years, though its form remains legible enough to trace.

A rath, or univallate ringfort, is an enclosed farmstead of the early medieval period, typically dating from roughly the fifth to the twelfth centuries. Single-banked examples like this one were the most common type across Ireland, built to protect a family, their livestock, and their goods rather than to serve any grand military purpose. The bank here is broken by a nine-metre gap in the north-east sector, most likely the original entrance. What makes the Aghacoora site particularly interesting is its immediate context. The landowner recorded that a fulacht fiadh once lay to the east of the rath. A fulacht fiadh is a prehistoric cooking site, usually identified by a horseshoe-shaped mound of fire-cracked stone beside a trough used for boiling water. The presence of one so close to the ringfort hints at a landscape with a longer and layered history of use, stretching back well before the early medieval farmers who built the enclosure itself. The site slopes gently south-east toward the River Brick, a practical position that would have offered both drainage and proximity to water.