Not because it has collapsed or been quarried away, but simply because the scrub has swallowed it whole. The earthwork is still there, almost certainly intact beneath the vegetation, but the landscape has quietly closed over it.

A rath, to use the Irish term, is a type of early medieval farmstead enclosed by one or more earthen banks and ditches, typically circular in plan. They were built and occupied across Ireland from roughly the early centuries of the first millennium through to the Norman period, and several thousand survive in various states of preservation. The Kilbehy example was recorded on the Ordnance Survey six-inch map of 1841 as an embanked circular enclosure with a diameter of approximately twenty-five metres, which is a fairly typical size for a single-family agricultural enclosure of this kind. By the time Denis Power compiled his survey notes, uploaded in August 2011, the monument was on an east-facing slope and the entire area had been overtaken by dense scrub vegetation. The rath itself was described as completely covered by overgrowth, invisible on the ground.

For anyone determined to locate this site, the 1841 OS mapping is the most useful reference point, and the modern OSI layers can be overlaid to get a rough sense of where the enclosure should sit on the slope. In practical terms, though, access through thick scrub is awkward and the earthwork's banks are unlikely to be distinguishable without clearance. There is no path, no marker, and no obvious reason the land would have been managed to expose the monument. The east-facing aspect means the slope catches morning light, which can occasionally help a trained eye read subtle undulations in terrain, but given the density of the vegetation described, that advantage is largely academic here. The site is the kind of place that rewards patience and a good map more than any particular season.