At Knockaunbrack in County Galway, a ringfort once occupied a patch of ground that the Ordnance Survey faithfully recorded on its six-inch maps as a circular enclosure roughly 30 metres across. Today, no visible surface trace survives. The site is, in the most literal sense, a place where something used to be.

A ringfort, or rath, is the commonest monument type in the Irish landscape: a roughly circular area of ground enclosed by one or more earthen banks and ditches, used as a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. The example at Knockaunbrack was described in 1914 by a writer named Neary, who recorded it as a circular earthen fort with a slightly convex interior, known as the garth. The bank, which stood around 0.9 metres high, had once been topped by a walled rampart, though even by the time Neary visited that upper structure had already disappeared. He measured the interior diameter at 120 feet, or just over 36 metres, which suggests a reasonably substantial enclosure by the standards of the type. The site sits some 50 metres to the east-northeast of a separate earthwork, indicating that this corner of Knockaunbrack once held more than one such feature within a small area, a reminder that these monuments clustered in settled, farmed landscapes rather than appearing in isolation.