Somewhere on the Curragh, the great open plain of County Kildare long associated with grazing, racing, and military encampment, there once existed a circular enclosure that has since vanished entirely, leaving not so much as a raised lip of earth to mark its passing. It appeared on the first edition of the Ordnance Survey six-inch map, surveyed in 1838, drawn as a circular feature roughly twenty metres in diameter. By the time the revised edition was published in 1941, it was gone from the record, and gone, apparently, from the ground itself.

The enclosure's form, as mapped in 1838, resembled two ringbarrows that survive nearby on the Curragh. A ringbarrow is a low, circular burial monument of prehistoric date, typically consisting of a central mound or flat area enclosed by a bank and ditch, and the Curragh retains several such features. Whether this particular enclosure shared the same origins as its neighbours, or was something else entirely, is now impossible to say with any certainty. What the mapping evidence suggests is that it was once visible and recognisable enough to be recorded by the OS surveyors, and that within roughly a century it had been reduced to nothing detectable at the surface. The Curragh's long history of military use, grazing, and general activity makes it a landscape where earthworks can disappear with relatively little ceremony.