At Knockeanagh in County Kerry, a ringfort that was once substantial enough to be recorded on the Ordnance Survey maps of 1842 has since been entirely absorbed back into the landscape. No earthwork survives, no trace of a bank or ditch, nothing to pause a passing walker. The south-east corner of a pastoral field is all that marks its general location now.

A ringfort, or rath, is a type of enclosed farmstead common across early medieval Ireland, typically formed by one or more earthen banks and ditches encircling a domestic area. They were the everyday settlements of farming families, built and occupied roughly between the fifth and twelfth centuries, and they survive in their thousands across the country. This one at Knockeanagh was still legible on the ground when nineteenth-century surveyors mapped it as a circular enclosure, but by the time the Air Corps flew aerial photography missions over Kerry in 1949, only the cropmark or soil shadow visible from above confirmed it was ever there at all. What the eye cannot see from ground level, changes in soil moisture or vegetation sometimes reveal from height, and that photographic record is now the primary evidence of the site's existence.

C. Toal documented it in the North Kerry Archaeological Survey, published in 1995, as entry number 688, by which point it had already been reduced to this ghostly cartographic and photographic presence. The gap between the 1842 map and the mid-twentieth-century aerial image leaves open the question of when, exactly, the earthworks were levelled, and by what combination of agricultural improvement, ploughing, and time.