This is a togher, an ancient Irish term for a trackway built across waterlogged or boggy ground, constructed by laying timber directly onto the soft surface to create a passable route. The example recorded at Corlea is modest in its dimensions, roughly 1.85 metres wide and just 18 centimetres deep, orientated on a northwest to southeast axis, but its very survival speaks to the preserving qualities of the anaerobic bog environment, which seals organic material against the decay that would otherwise consume it within a generation.

The Corlea togher belongs to what archaeologists classify as a class 3 type, built from transverse roundwood and brushwood rather than the more elaborate split-plank construction seen in higher-status trackways. The timbers used were ash, oak, and hazel, all native Irish species that would have been readily available from managed woodland in the early medieval or prehistoric period. Roundwood and brushwood toghers of this kind were essentially utilitarian, laid down to allow people, animals, or perhaps loaded carts to cross ground that would otherwise have been impassable during wetter seasons. Corlea is already well known for its remarkable Iron Age plank road, dated to 148 BC and now partly preserved in a dedicated visitor centre nearby, and this class 3 togher represents a quieter piece of the same broader landscape of wetland travel and movement that made the midland bogs navigable across many centuries.