At Boolaglass in County Limerick, a small circular enclosure once occupied a gentle south-east-facing slope of pastureland, modest in scale at roughly ten metres in diameter and defined by an earthen bank. It was recorded, mapped, and then, somewhere between the cartographer's pen and the present day, it disappeared entirely.

The enclosure was captured on the Ordnance Survey six-inch map of 1923, depicted as an embanked circular enclosure, the kind of low earthwork that appears with some regularity across the Irish countryside and typically dates to the early medieval period. Such enclosures, often called ringforts, served as enclosed farmsteads, their banks and ditches marking out a household's space against the landscape. At ten metres across, Boolaglass would have been a small example, perhaps a satellite enclosure associated with a larger settlement nearby, or simply a modest farmstead in its own right. When Denis Power compiled the site record and carried out an inspection, uploaded in August 2011, no trace of the monument remained visible on the ground. It had been levelled, most likely through agricultural activity over the decades since the OS survey.

For anyone curious enough to visit, the site sits within pasture on a gently sloping field, and there is nothing on the surface to indicate that anything was ever there. The surrounding landscape is quiet and unremarkable in the way that much of rural Limerick is, which makes the absence feel oddly appropriate. The value here is less in what can be seen and more in the exercise of reading the landscape against old maps, tracing what the 1923 survey recorded and comparing it to the unmarked ground underfoot. The six-inch OS maps, digitised and freely available through the OSi historical mapping viewer, remain the best way to locate the original position of the enclosure. What Boolaglass offers, in the end, is a small and sobering lesson in how quickly even a documented monument can be erased from a working agricultural landscape.