The trees occupy the interior of a rath, the Irish term for a ringfort, one of the most common monument types in the Irish countryside yet one that most people pass without recognising. This example sits on a south-west-facing slope above the Dripsey River valley, a position typical of the type: elevated enough to command a view, sheltered enough for everyday life.

The rath takes the form of a roughly circular enclosure about thirty metres in diameter, defined by an earthen bank that still stands to a height of around 1.36 metres and is faced with stone. Ringforts of this kind were generally built during the early medieval period, roughly between the fifth and twelfth centuries, and functioned as enclosed farmsteads, the bank and any associated ditch providing a degree of security for livestock and inhabitants alike. What makes the Barrahaurin site particularly interesting is its relationship to a souterrain located approximately 190 metres to the west-south-west. A souterrain is an underground stone-lined passage or chamber, typically associated with nearby ringforts and thought to have served for storage, refuge, or both. Whether the two features were built and used together is not certain, but the proximity is suggestive and fits a pattern seen across many early medieval farming settlements in Munster.

The planted conifers inside the enclosure are a common fate for ringforts in agricultural Ireland, where landowners sometimes found the raised interior useful for shelter planting. The trees make the interior difficult to read on the ground but also, in a roundabout way, have preserved it from more damaging interventions. The enclosing bank, visible from the surrounding pasture, gives a clear sense of the original shape and scale of the site.