The raised platform, roughly thirty metres north to south and thirty-two metres east to west, is surrounded by a scarp two metres high with a low internal lip, and on the north-eastern to east-south-eastern arc, an outer bank of dumped stone construction rises to around 1.4 metres. Between the two banks runs a berm or shallow fosse, a broad flattened ditch about six metres wide, which would once have added a further layer of definition and defence to the enclosure. The entrance, cutting through both banks on the south-eastern side, is just two metres wide, a narrow and deliberate threshold.

This is a rath, the Irish term for a ringfort, the most common surviving monument type in the Irish landscape. Raths were typically built during the early medieval period, roughly from the fifth to the twelfth century, and functioned as enclosed farmsteads, the circular bank and ditch marking out the territory of a family or small community and offering protection for people and livestock. What makes the Moneyreague example particularly legible is the way its construction varies around the circuit: dump stone on one arc, a stone-faced scarp on another, suggesting either different phases of work or the pragmatic use of whatever material was closest to hand. Running east to west across the interior are cultivation ridges, the remains of later farming activity, which tell their own quiet story about how the enclosed space was repurposed long after the original inhabitants were gone.