At Ballyegan in County Kerry, an earthwork enclosure survived long enough to be mapped in the late nineteenth century, only to be quarried out of existence before 1995. What remains is essentially a cartographic ghost, documented in two dimensions but gone from the ground entirely.

The enclosure first appears on the Ordnance Survey 25-inch plan of 1892, where it is shown as a single-banked oblong feature, roughly 38 metres on its north-west to south-east axis and around 30 metres across. That style of mapping, using hachures, short lines drawn down a slope to suggest the profile of an earthwork bank, gives some sense of what surveyors saw: a low, enclosed outline, probably of the kind associated with early settlement or landholding in the Irish countryside. Notably, it was absent from the earlier first-edition OS 6-inch map of 1841, which raises the question of whether it was genuinely overlooked in the earlier survey or whether the feature was, for some reason, only clearly visible or considered significant by the time the more detailed 25-inch mapping was carried out. Either way, the window between those two surveys is the only period in which the enclosure is documented at all. By the time anyone thought to assess it formally, quarrying had already removed whatever physical evidence once remained.