Others survive only as marks on old maps, their physical presence erased so completely that nothing remains to visit. The small circular enclosure that once stood at Sackville in north County Kerry belongs to this last and quietest category. It appears on the Ordnance Survey maps of 1841 to 1842 and again on the revision of 1898, a modest ring on paper suggesting a site that was still visible, at least to the surveyors, across the latter half of the nineteenth century. At some point after that, a quarry removed it entirely.

Circular enclosures of this kind are among the most common archaeological monument types in Ireland, typically interpreted as the remains of ringforts, the enclosed farmsteads that served as the basic unit of rural settlement from the early medieval period onwards. Without excavation it is impossible to say what the Sackville example contained or when it was built, and no such investigation was ever carried out before the site was destroyed. Its presence on two successive Ordnance Survey maps is now the most substantial record it has left behind. The 1840s survey, one of the most detailed cartographic exercises ever undertaken in Ireland, captured thousands of such features, many of which have since vanished to agriculture, development, or, as here, extraction.