At Ballaghadigue in north County Kerry, a circular enclosure once existed, mapped and recorded, but by the time anyone thought to look for it again, it had gone entirely. No earthwork, no outline, no trace in the grass. The preservation order remains on the books; the thing it preserves does not remain on the ground.

The enclosure appeared on the Ordnance Survey map of 1841 to 1842, marked as a circular feature of the kind that archaeologists generally associate with early medieval settlement, a ringfort or similar enclosure used to define a farmstead or enclosure boundary. By the time the revised OS edition was produced in 1939, it had been dropped from the map altogether, suggesting it had already disappeared from the landscape by then, cleared or ploughed out during the intervening century of agricultural change. C. Toal documented the site in the North Kerry Archaeological Survey published in 1995, noting even then that no visible trace survived.

What remains is, in a sense, only cartographic. The 1841 to 1842 map preserves the memory of the enclosure more faithfully than the land itself does. It is a reminder that the archaeological record of any region includes absences as well as survivals, and that what gets mapped in one generation can quietly vanish before the next one arrives to look.