It is, by any modern measure, an unremarkable width, just 1.2 metres across and barely a tenth of a metre deep, yet it represents a piece of genuinely ancient engineering that the bog has quietly held onto ever since.

The structure is a togher, an Irish term for a timber trackway constructed across boggy or marshy terrain. This particular example is classed as a class 3 togher, meaning it was built using a single layer of transverse roundwood, that is, small trimmed branches or poles laid crosswise to the direction of travel, resting on occasional lengths of longitudinal brushwood laid underneath to give the surface something to sit on. The whole thing runs east to west. The timbers identified at the site are hazel and birch, both common in Irish woodland and well suited to this kind of work; hazel in particular was widely coppiced and used in construction throughout prehistoric and early medieval Ireland. The peat environment, low in oxygen and naturally acidic, is what allowed the organic material to survive at all, the same chemistry that has preserved bog bodies, leather, and wooden vessels elsewhere on the island.