It is not dramatic in scale, measuring approximately 25 metres north to south and 24 metres east to west, but that modest footprint is itself part of the point. This is what early medieval Ireland looked like at its most ordinary and domestic, a rath, or ringfort, of the kind that once dotted the countryside in their tens of thousands and served as the enclosed farmsteads of farming families across the island.

A rath typically consists of a circular or subcircular area defined by one or more earthen banks, known as a cashel when built in stone, with a fosse, or ditch, dug on the outside to provide both the material for the bank and a further layer of enclosure. The Ballagh example follows this pattern closely. The bank survives in fair condition, the external fosse remains visible, and a gap roughly 3.3 metres wide on the eastern side may represent the original entrance, which in many ringforts faced east, possibly for reasons connected to the rising sun or simply the prevailing wind. What lends this particular site a little extra interest is its relationship to the wider landscape: another earthwork lies approximately 150 metres to the south-east, suggesting that this was not an isolated dwelling but part of a broader pattern of early settlement in the area, farmsteads close enough to be neighbours, separated by the kind of distance that made for community without crowding.