The shape is subcircular rather than perfectly round, measuring roughly 36 metres east to west and 33 metres north to south, and while time has softened its edges it remains in fair condition, legible enough in the landscape to reward a careful eye.

A rath is an earthen ringfort, typically dating from the early medieval period in Ireland, roughly between the fifth and twelfth centuries. They served as enclosed farmsteads, the encircling bank providing a degree of security for a family, their livestock, and their outbuildings within. Thousands survive across the Irish countryside in varying states of preservation, though many have been levelled by agriculture or simply forgotten. The Mirehill example is not an isolated feature: a further enclosure lies approximately 220 metres to the north-east, suggesting that this stretch of land once supported more than one such settlement, a reminder that what now looks like empty farmland was once a worked and inhabited place.