This is a rath, the Irish term for a ringfort, the most common type of monument in early medieval Ireland. Ringforts were typically enclosed farmsteads, home to a single family and their livestock, defined by one or more earthen banks and an external ditch known as a fosse. This one, near Balreagh, measures approximately thirty metres across on its north-west to south-east axis, and the ridge it occupies gives it long views in every direction, which is precisely the kind of elevated, defensible position that suited these enclosures.

What survives today is fragmentary. The surrounding bank is poorly preserved, and the fosse that once ran outside it is now shallow. At the north-east and southern edges, the perimeter has been actively quarried away, meaning the earthwork has been physically reduced over time by human activity rather than simply weathered down. There is a modern gap at the west-north-west of the enclosure, though no trace remains of where an original entrance once stood. Inside, in the north-west quadrant, a grass-covered rectangular outline marks what may have been a hut site, a faint impression of the domestic life once contained within these banks. The enclosure as a whole is raised above the surrounding ground level, as is typical of a rath, and the undulating grassland around it gives little away about the ridge's early significance.