The Corlea togher, a togher being an ancient trackway of wooden planks and branches laid across waterlogged or boggy ground, stretches for at least 750 metres in an east-north-east to south-west orientation. At 2.5 metres wide, it was no casual foot-path through the marsh. Whoever built it intended something substantial.

The structure, first noted in 1988, follows a carefully layered logic. Longitudinal runners and transverse roundwood formed the base, while a superstructure of split stems and more transverse roundwood was laid on top, the whole assembly functioning like a primitive raft spread across unstable ground. Dendrochronological dating, which works by matching tree-ring patterns in ancient timber to establish precise felling dates, placed construction at around 2259 BC, give or take nine years. That puts this particular togher firmly in the Early Bronze Age, at a time when metal tools were only beginning to enter use in Ireland. The evidence is there in the wood itself: researchers found marks consistent with a metal implement, which is striking given how early that places the use of such technology on an Irish bog. By the time the site was reinspected in 1999, surface exposure across twelve milled peat fields had revealed around 225 metres of the surviving structure, made up of parallel roundwood, brushwood ranging from two to six centimetres in diameter, and twigs. Among the pieces recovered was one worked to a chisel point at one end, a small but telling detail about the care brought to the original construction. The work on this togher was led by the late Professor Barry Raftery, whose research brought the Corlea bogs to wider scholarly attention during the 1990s.