Others simply vanish between one map and the next, leaving behind only the question of what was ever there. A circular enclosure once recorded at Leath in County Kerry belongs to the second category. Sometime between the mid-nineteenth century and the end of it, the feature disappeared entirely, and today no physical trace survives on the ground.

The enclosure appears on the Ordnance Survey map produced between 1841 and 1842, sitting on boggy land, drawn in with whatever confidence the surveying parties placed in what they could observe. Circular enclosures of this kind are a common enough feature of the Irish landscape, typically earthen ringforts or the remains of them, structures that served as enclosed farmsteads from the early medieval period onward. Whether this one was a genuine early medieval enclosure, a later field boundary, or something else entirely is now impossible to say with certainty. By the time the revised Ordnance Survey map was produced in 1898, it had already gone, leaving no mark. The boggy terrain around Leath offers a plausible explanation: waterlogged ground is hard on earthworks, and what the surveyors of the 1840s recorded may already have been in poor condition, the last visible remnant of something much older slowly dissolving back into the landscape.