On the south-south-eastern slope of a low hill in Agharra, County Longford, a circular enclosure was recorded more than two centuries ago and then, to all appearances, vanished, not through demolition or dramatic erasure, but simply by ceasing to be visible at ground level.

The enclosure appears on the Grand Jury map of 1813, drawn as a circular feature in the pasture of a gentle hillside. Grand Jury maps were produced for county administrative purposes in the early nineteenth century, often capturing landscape details that predate the more familiar Ordnance Survey coverage. When the OS six-inch mapping was carried out, the enclosure did not make it onto any edition, and today the site shows nothing to a person walking across it. Circular enclosures of this kind are generally understood to be the remains of early medieval or prehistoric settlements, the low banks or ditches that once defined a farmstead or enclosed ground for livestock, reduced over generations of agriculture until the earthwork itself disappears beneath the sod. What survives at Agharra, if anything survives at all, lies entirely below the surface.