The ground is pasture, the field is unremarkable, and nothing breaks the grass to suggest that anything of significance ever stood there. Yet the 1842 Ordnance Survey six-inch map records what was then still legible as a roughly oval enclosure, measuring approximately 70 metres north to south and 50 metres east to west. By the time anyone thought to document it formally, it had already been levelled, leaving the map as the sole surviving witness.

Enclosures of this general type are among the most common, and most varied, class of monument in the Irish landscape. The term covers everything from the familiar ringfort, a farmstead enclosed by an earthen bank and used through the early medieval period, to prehistoric ceremonial sites and livestock enclosures of uncertain date. Without excavation, it is rarely possible to say which category a levelled example belonged to. What the Knockraha enclosure's dimensions do suggest is that it was substantial, larger than the typical small domestic ringfort, though size alone is not enough to pin down its function or age. It survives now only as a shape on a nineteenth-century map, a ghost outline on a slope that farmers have long since returned to ordinary use.