The rath at Kilmona in County Cork was levelled around 1974, the earthwork broken up and absorbed into the surrounding tillage on a north-facing slope. Yet from the air it remains legible, a ghostly soil mark pressed into the field, the circular outline of a vanished enclosure still readable to anyone looking down from above.

A rath is an earthen ringfort, typically a circular area enclosed by one or more banks and ditches, used as a farmstead or settlement during the early medieval period in Ireland. This one measured roughly 40 metres in diameter, a modest but not unusual size. What makes the Kilmona example quietly striking is how long it endured in the cartographic record before it was finally erased. Ordnance Survey six-inch maps from 1842, 1904, and 1938 all show the same hachured circular enclosure on the slope, the hachuring being the conventional marking used by surveyors to indicate an earthwork or raised feature. For well over a century the rath sat in the landscape, mapped and remapped, before local land improvement works removed it in the early 1970s. Its presence in three successive OS surveys, spanning nearly a hundred years, gives some sense of how intact it remained right up until the moment it was not.