In wet pastureland on the western edge of a ridge in Derryvunlam, County Galway, there is a patch of ground that appears entirely unremarkable. No earthwork rises from the grass, no ditch catches the eye, no trace of a perimeter survives. Yet this was once, in all likelihood, a rath, the Irish term for a ringfort, a circular enclosure defined by one or more earthen banks that served as a farmstead and dwelling place during the early medieval period, roughly the fifth to twelfth centuries. Thousands of raths were built across Ireland; this is what makes their gradual disappearance from the landscape not dramatic so much as quietly persistent.

The Ordnance Survey six-inch map of 1928 still recorded a circular enclosure here, with a diameter of approximately 35 metres. That is a modest but perfectly typical size for a rath of this kind. By the time the third edition of the OS map was produced in 1920, the feature had already been partially levelled, the work of agricultural improvement slowly overtaking whatever remained of the original bank and ditch. The dating of the two map editions is worth pausing over: the 1928 reference presumably reflects a revision or annotation of earlier survey work, since the third edition preceded it. Either way, within a relatively short window of the twentieth century, the enclosure had gone from being mappable to being essentially erased. No visible surface trace survives today, and the classification as a rath carries the honest qualifier of uncertainty.