On a low hillock in the grassland at Lissanard, County Galway, there is a ringfort that can no longer be seen. A ringfort, or rath, is an early medieval enclosed settlement, typically circular, defined by one or more earthen banks and ditches. This one has been absorbed so thoroughly into the surrounding farmland that when archaeologists visited in September 1983, no visible surface trace survived at all. What remained was a suggestion: a slight curve in a field bank to the north, quietly echoing the outline of something that had once stood there.

The site has a paper trail that reveals the gradual process of its disappearance. The 1838 edition of the Ordnance Survey six-inch map records it clearly as a circular enclosure on its hillock. By the time the more detailed OS 1:2500 plan was surveyed between 1912 and 1916, something had already shifted. The shape recorded was no longer cleanly circular but more subrectangular, running approximately 49 metres on a northwest to southeast axis and around 41 metres north to south. Field boundaries had begun to overlie the enclosing element across much of its circuit, from the northwest around through east to southwest. The map evidence alone charts the creeping encroachment of agricultural reorganisation across a feature that had probably stood largely intact for over a thousand years before the nineteenth century.