This earthwork near Fountain in County Clare earns its place by having vanished entirely, consumed by the very ground it once sat upon. What was once a circular enclosure roughly 40 metres across, sitting towards the bottom of an east-facing slope, now exists only as a mark on paper and a set of map coordinates pointing at empty air.

The feature appeared on Ordnance Survey six-inch maps in both 1842 and 1921, recorded as a circular earthwork of modest but clear dimensions. Enclosures of this kind are a common enough form in the Irish landscape, typically interpreted as the remains of a ringfort or a similar enclosed settlement, where a raised bank and sometimes a ditch would have defined a farmstead or place of habitation, often dating to the early medieval period. By 1992 and again in 1996, the site was formally catalogued in the national monument records as an enclosure, which gave it a recognised status on paper. When inspectors visited in 2000, however, the monument had already disappeared from the ground entirely. An active quarry immediately to the west had done its work, and the earthwork had been quarried out completely. The site now belongs to a category that archaeology occasionally has to reckon with: the monument that is known to have existed, that was mapped and listed and assigned a reference number, but that cannot be visited, studied, or even seen.