A shallow circular depression, barely enough to catch a visitor's eye, marks what was once a rath, the Irish term for a ringfort, one of the most common monument types in the Irish landscape. Thousands of these enclosed farmsteads were built during the early medieval period, roughly between the fifth and twelfth centuries, and their earthen banks once defined the domestic and agricultural lives of farming families across the country. Here, the bank has long since eroded, leaving only the faint bowl of its outline pressed into the land.

What makes the Garranes site quietly notable is the presence of a souterrain in its interior. A souterrain is an underground stone-lined passage or chamber, typically dug beneath or beside a ringfort during the early medieval period. Their exact purposes are debated, but they were likely used for cool storage, as refuges, or both. They were constructed with considerable effort and their presence suggests a settlement of some permanence and organisation. The souterrain here has been recorded separately, which indicates it survives in some form beneath the surface even as the earthwork above it has largely disappeared.