Rather than occupying the commanding high ground that many of its counterparts favour, the rath at Ballyrune sits low, close to the base of an east-facing slope that descends towards marsh, in an area where limestone breaks through the surface in visible seams. It is the kind of placement that prompts questions. The people who built here were not seeking a dramatic vantage point; they were working with wetter, more marginal terrain, and the site reflects that compromise.

Ringforts, known variously as raths or lios, were the most common form of rural settlement in early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries. They consist of a roughly circular enclosed area defined by one or more earthen or stone banks, and served as farmsteads rather than fortifications in the military sense. The Ballyrune example is sub-circular in plan, measuring approximately 23.6 metres north to south and 28.3 metres east to west, enclosed by a combined earth-and-stone bank. The bank stands around 0.7 metres on the interior face and 0.5 metres on the exterior, which is modest but still legible on the ground. It is best preserved along the arc running from the south-east around to the west-northwest. What is particularly notable at the north-east section is that the builders incorporated exposed seams of natural bedrock directly into the bank structure, using the local limestone as it emerged from the ground rather than quarrying or importing additional material. The record was compiled by Denis Power and uploaded in August 2011, with aerial photographs taken in March 2006 providing additional survey data.

The interior of the enclosure slopes gently downward to the east, towards the marsh, and is now covered with hawthorn trees, which is not unusual. Hawthorns have long been associated with ringforts in Irish folk tradition, and many survive precisely because local reluctance to disturb them offered a degree of informal protection across the centuries. A visitor approaching on foot across the low pasture will find the earthwork subtle rather than dramatic, the kind of feature that resolves itself slowly as you get closer. The limestone outcrops in the surrounding fields give some sense of the geology the original builders were working within, and the section of bank where bedrock meets constructed earthwork at the north-east is worth examining closely.