In the gently undulating grassland of Cuilleen in County Galway, a cashel sits so thoroughly eroded that its southern and south-eastern arc has vanished entirely from the surface. What remains is barely legible, the rest absorbed into the field it once commanded.

A cashel is a ringfort enclosed by a drystone wall rather than an earthen bank, a form common across the west of Ireland where stone was more plentiful than deep soil. This example is roughly circular and approximately 42 metres in diameter, which would have made it a reasonably substantial enclosure in its time. Such structures date broadly to the early medieval period, roughly the fifth to twelfth centuries, and typically served as farmsteads for a single family or kin group, the wall offering protection for people and livestock alike. At Cuilleen, the surviving portion of that wall has been further compromised by a field boundary laid directly on top of it, a commonplace fate for ancient stonework in a landscape where farmers have always needed ready-cut material. The result is a site where the archaeology and the working land have become almost indistinguishable from one another.