The enclosure at Derrybrien is not dramatic to look at; poorly preserved and defined only by a scarp, a low earthen edge where the ground drops away, it measures roughly 63 metres east to west and 42 metres north to south. That a later boundary wall or ditch was simply laid over it suggests the enclosure had already lost whatever social or practical meaning it once held by the time the surrounding land was parcelled up.

Enclosures of this kind are among the most common, and most ambiguous, features in the Irish archaeological landscape. They may have served as farmsteads, as cattle enclosures, or as something with a more ceremonial function; without excavation, the oval outline at Derrybrien keeps its purpose to itself. What the shape and scarp do confirm is that people chose this particular slope deliberately, orienting the site to catch southern light and positioning it to overlook the river below. The Owendalulleegh drains a stretch of upland Galway that was never heavily settled, which makes the presence of any structured enclosure here quietly notable.