In a field of flat grassland in Addergoole, County Galway, the ground gives no hint that anything lies beneath it, no earthwork, no raised ring, no scatter of stone. Yet the Ordnance Survey six-inch maps, those meticulous nineteenth-century records that captured Ireland's landscape before so much of it was rearranged or erased, mark this spot as a subcircular enclosure, roughly forty metres north to south and thirty-five metres east to west. Somewhere underfoot, the ghost of a ringfort or similar enclosed settlement persists, invisible to anyone walking across it.

The enclosure belongs to a category of monument that once shaped the Irish countryside in enormous numbers. Ringforts, known in Irish as raths or lises, were typically circular or near-circular enclosures defined by earthen banks and ditches, used as farmsteads and settlement sites from roughly the early medieval period onward. The "lis" element in Lisnabitteen points directly to that tradition. What undid this particular example was something mundane: a field boundary, running from north to south-southwest, was cut straight through the monument at some point after the OS surveyors recorded it, and the gradual work of farming did the rest. By the time anyone looked again with archaeological attention, no surface trace survived.