The Curragh of Kildare is one of Ireland's most unusual landscapes, a vast open limestone plain that has been grazed, drilled on, and dug into for centuries. Somewhere beneath or beside its western military edge, a circular enclosure roughly 25 metres across once existed, at least on paper. It appears on the first edition Ordnance Survey six-inch map of 1838, drawn with enough confidence to suggest it was a recognisable feature on the ground at the time. By the revised edition of 1941, it had vanished from the record entirely, replaced in that portion of the map by a gravel pit. Whether the enclosure was destroyed in the course of quarrying, or had already disappeared before the surveyors returned, cannot now be determined.

Circular enclosures of this kind are a common but varied class of feature in Irish archaeology, ranging from prehistoric ring-ditches to early medieval ringforts, the latter being small enclosed farmsteads that once peppered the Irish countryside in their thousands. A diameter of around 25 metres would place this example towards the smaller end of that range. The Curragh itself has a long and complicated history of military use, with a permanent camp established there in the nineteenth century, and the western edge of that camp is where this feature was recorded. Gravel extraction, combined with the sustained disturbance that accompanies any active military installation, would have been more than sufficient to erase surface traces of a modest earthwork. No visible remains survive today.