The rectangular earthwork sits on a gentle south-west-facing slope in undulating grassland within a broad river valley, defined by a bank running along three sides, yet deliberately open on the east, where the ground drops away in a steep scarp. That opening is not a gap worn by time or cattle; it appears to be original, and it faces the fall of the land rather than sheltering from it.

The enclosure measures roughly 16 metres north to south and 17 metres east to west, modest dimensions that suggest a functional rather than defensive purpose. Rectangular enclosures of this kind are found across Ireland and are often associated with agricultural or settlement activity, though without excavation it is rarely possible to say with certainty what happened inside them. What sets Rathreagh apart is that this enclosure does not stand alone. Three metres to the north sits a second rectangular enclosure, similarly aligned east to west. Above that, two further rectangular enclosures share a common boundary, built conjoined, meaning they were likely planned or used together as a single complex. To the north-west, immediately west of those two northerly enclosures, sits a circular enclosure, the kind of form often associated in the Irish landscape with early medieval settlement or field systems. Five enclosures in close proximity, mixing rectangular and circular forms, suggests a landscape that was organised with some deliberateness, whatever the purpose.

The bank on the north, south, and west sides of the primary enclosure is described as well preserved, which in earthwork terms is notable. Grassland sites like this are vulnerable to ploughing and land improvement, so survival in reasonable condition across most of the perimeter is worth remarking on. The sloping ground and the steep scarp to the east would have shaped how this cluster of enclosures functioned and how they related to one another across the hillside.