At Creagh in County Cork, a rath, which is the Irish term for a ringfort, a circular earthen enclosure typically used as a farmstead during the early medieval period, survives only in its northeastern arc. The southwestern half was obliterated when a railway line was driven through the site, leaving behind a semicircle rather than the complete enclosure that once defined this place.

The Ordnance Survey six-inch map of 1842 recorded the fort as a complete circular enclosure, its banks marked with the hachuring that cartographers used to indicate earthworks. At some point after that survey, the railway came through and removed the southwestern portion entirely. What remains to the northeast is a curved earthen bank standing roughly 0.9 metres high, enclosing a semicircular interior. The railway itself is now disused, so the site sits between a working tillage field and an abandoned line, both forces of agricultural and industrial change having left their mark on something that had already survived well over a thousand years. The bank and its interior are heavily overgrown, which is typical of earthworks that have passed out of any functional use and been left to their own gradual processes of encroachment.