That hollow, roughly twenty metres in diameter, is the ghost of an enclosure, the kind of roughly circular earthwork that once served as a farmstead, a place of assembly, or a boundary marking livestock and territory during the early medieval period in Ireland. The enclosure itself has vanished; what survives is only the faint depression it left behind.

When the first edition of the Ordnance Survey six-inch map was produced in the nineteenth century, the feature was still legible enough in the landscape to be recorded as a circular enclosure. That mapping exercise, carried out with considerable care for its time, caught thousands of earthworks across Ireland at a moment when many were already in decline from centuries of farming and land improvement. In Lurgan's case, the intervening years have been thorough in their erasure. By the time the site was catalogued for the Archaeological Inventory of County Galway, compiled by Olive Alcock, Kathy de hÓra, and Paul Gosling and published in 1999, even the surface trace had effectively gone, leaving only that shallow hollow as evidence of what the mapmakers saw.

There is little to direct a visitor here in any practical sense. The site sits on level ground, and without the nineteenth-century map as a guide, the depression itself would read as nothing more than a slight unevenness underfoot. Its interest lies less in what can be seen and more in what the sequence of documentation reveals: a feature recorded, gradually lost, and now surviving only as a cartographic memory and a minor irregularity in the field.