The enclosure at Coololla is not obvious to the casual eye. Its defining bank, a raised earthen boundary that would originally have delineated the site clearly, survives only along part of its circuit, from the north-west around through the east to the south-west. Where the rest of it once ran, the earth has been levelled flat, and the only hint of its former line is a growth of nettles and thistles, plants that have a habit of colonising disturbed or nutrient-rich ground where old structures have collapsed or been spread.

The enclosure measures roughly 37 metres east to west and 26 metres north to south, making it a modest but not insignificant size. Enclosures of this broadly subcircular type are scattered across the Irish landscape and can date from the early medieval period onwards, though without excavation it is rarely possible to say precisely when or for what purpose any individual example was built. They may have served as farmsteads, as enclosures for livestock, or as boundaries around a dwelling of some kind. Inside the Coololla enclosure, in the south-west quadrant, there is a low moss-covered mound, barely twenty centimetres high, irregular in shape. Whether it represents the last traces of a structure, a deliberate feature of the original enclosure, or simply an accident of later land use is not something the surface alone can answer.

What makes this particular site quietly interesting is precisely the degree to which it has almost disappeared. The nettles tracing the vanished bank are doing the work that the earthwork itself can no longer do, keeping the outline legible in the landscape for those who know to look for it.