It follows, and partly destroys, the outer ring of an early medieval earthwork that has been sitting in a tillage field for well over a thousand years. The road clips the second bank and the fosse between the two enclosures on the northern side, meaning that agriculture and infrastructure have each quietly taken their toll, yet enough survives to read the site clearly.

What remains is a rath, the most common type of defended farmstead in early medieval Ireland, typically dating from roughly the fifth to the twelfth century. A rath consists of one or more earthen banks with intervening fosses, the fosses being the ditches dug to provide the material for the banks, enclosing a roughly circular area where a family and their livestock would have lived. At Ballyregan More, the interior measures approximately 36 metres east to west and 35.5 metres north to south, enclosed by an earthen bank standing about 1.15 metres above the interior ground level. Beyond that lies a fosse, and then a second bank reaching 1.2 metres in height, which survives from the north-east around to the north-west and from the south-west back around to the north-west. The entrance, 7 metres wide, faces south-east, an orientation that would have caught morning light on an east-south-east-facing slope, a practical as much as a symbolic choice for people who rose with the sun and whose cattle needed to move in and out daily.

The double-bank arrangement, though partially lost to the road, suggests this was a biallate rath, a slightly more elaborate form that may reflect the higher social standing of its occupants, though it is unwise to push that inference too far without excavation. What is certain is that the crop fields around it have preserved the earthworks well enough to make out the full original circuit, even where the modern road has cut through.