This is a ring barrow, a type of funerary monument built during the Bronze Age, in which a burial was placed at the centre and surrounded by a ditch and an enclosing outer bank. At Moneen, the whole structure stretches to an overall diameter of 36.2 metres, making it a notably substantial example. The central area, roughly 7.5 metres across, sits at or very slightly below the level of the surrounding field, and the fosse, the encircling ditch, is both wide and deep. The outer bank is wide and flat, tapering gradually down to the natural field level beyond it.

The geometry of the monument is unusually well preserved, which makes its few anomalies all the more noticeable. A gap in the north-western quadrant is thought to be a modern intrusion rather than an original feature, and a shallow depression at the centre hints at some past disturbance, possibly the result of earlier digging into the mound. What lends the site an extra layer of interest is its proximity to a rath, an enclosed farmstead of early medieval date, which lies just 25 metres to the south-east. The pairing is a reminder that later communities did not always treat prehistoric monuments as obstacles to be cleared; sometimes they simply settled alongside them, perhaps reading significance into earthworks they did not fully understand. The ring barrow at Moneen has been subject to a preservation order since 1956, offering it at least some formal protection within the working agricultural landscape it still occupies.