Near Ballymagooly in north County Cork, close to the southern bank of the River Blackwater, there is a circular earthwork that belongs firmly to the second category. By the time anyone thought to go looking for it on the ground, it had already disappeared.

The site is known from a 1936 Ordnance Survey six-inch map, where it appears as a hachured circular raised area, the standard cartographic shorthand for an earthwork, with a diameter of roughly 22 metres. That is a modest but not insignificant size, comparable to a small ringfort, the kind of enclosed farmstead that was common across Ireland from the early medieval period onward. The location, about 150 metres south of the Blackwater and within what later became the area of the old Mallow dump, gives some sense of why the feature vanished. Scrubland, waste ground, and the accumulation of material associated with a municipal dump are not conditions that favour the survival of low earthen features. Whatever was raised here, field bank, enclosure, or something older, was levelled or buried without leaving any visible surface trace.