It is a rath, the Irish term for a ringfort, which is a circular or near-circular enclosure built during the early medieval period, typically between the fifth and twelfth centuries, and used as a farmstead or defended homestead. Thousands survive across Ireland in various states of preservation, yet each one occupies its landscape in a slightly different way, and this example at Croker's Park has a character of its own.

The earthwork is oval rather than perfectly round, measuring approximately 33 metres on its north-south axis and 28 metres east to west. What defines it is a scarped edge, essentially a cut or trimmed slope in the ground, rising about a metre in height and spreading some six and a half metres in width. A dry-stone field wall, running roughly east-west, has clipped the scarp at some point, one of those practical agricultural intrusions that slowly accumulate over centuries of land use. At the north-west, the scarp pushes outward from the expected line of the oval, a detail that the survey compiler Denis Power attributed to outcropping limestone beneath the surface, the underlying geology quietly shaping what was built above it. The interior of the enclosure, now under pasture like the surrounding land, slopes gently downward toward the south.

The site sits on a gentle rise within undulating terrain, which would have been a logical choice for early medieval farmers seeking both drainage and visibility. Because it lies within a working field, access is not guaranteed without permission from the landowner. The earthwork is subtle at ground level, and its oval outline is best appreciated by walking the perimeter slowly and watching for the change in gradient underfoot. The low scarp, worn by centuries of grazing, is unlikely to register as dramatic from a distance, but close up the deliberateness of the original shaping becomes apparent. Early autumn, when the grass is shorter and the ground drier, tends to make earthworks of this kind easier to read.