At Knockenagh in County Kerry, a rath once stood just north of a quarry, its circular earthen bank enclosing a space that would have been someone's defended farmstead during the early medieval period. A rath is essentially a ringfort, a circular enclosure bounded by one or more earthen banks and ditches, used across Ireland roughly between the fifth and twelfth centuries as a farmstead and place of security for a family and their livestock. This one at Knockenagh appeared on Ordnance Survey maps as recently as 1914, which means it survived into living memory of people now gone. Today, the quarry beside it has expanded until the enclosure has vanished completely, leaving no surface trace whatsoever.

The site was recorded in C. Toal's North Kerry Archaeological Survey, published in 1995, which noted that the circular enclosure had already been completely levelled by that point and that the adjacent quarry had extended over or through the area where it once stood. The mapping evidence, drawn from the 1841 to 1842 and the 1914 Ordnance Survey editions, confirms that the rath was still legible on the landscape well into the twentieth century, making its disappearance a relatively recent event in archaeological terms. Thousands of ringforts survive across Ireland, but a significant number have been lost to agricultural improvement, development, and quarrying, and Knockenagh represents precisely that pattern of attrition, documented just well enough to confirm what is no longer there.