It is a togher, the Irish term for a timber trackway laid across soft or waterlogged ground, and this particular example was constructed from two distinct layers: a base of very fine ash brushwood topped with split-oak timbers, running in a north-east to south-west orientation across the ancient wetland.

Corlea is already known for one of the most remarkable prehistoric roads in Europe, a massive Iron Age oak trackway dated to 148 BC and now partially preserved in a dedicated interpretive centre nearby. This class 3 togher is a quieter, less celebrated feature of the same boggy landscape. The classification system for tochairs distinguishes between road types by their construction method and scale; a class 3 togher typically involves a more modest, layered brushwood-and-timber technique rather than the heavy planking of the grand ceremonial roads. The combination of ash brushwood and split oak is practical engineering, using readily available woodland materials to distribute weight across ground that would otherwise swallow a traveller whole. Bogs preserve organic material with remarkable fidelity, keeping wood, leather, and even human remains intact for millennia under anaerobic, acidic conditions, which is why sites like Corlea continue to yield evidence that would vanish almost instantly in drier soils.