This is a togher, the Irish term for a trackway constructed through bog or marsh, and the Corlea area contains some of the most significant examples known anywhere in Ireland or Europe.

This particular togher is classed as a class 3 example, meaning it was built using longitudinal roundwood, that is, lengths of timber laid lengthways along the direction of travel rather than across it, a construction method suited to providing a relatively narrow, stable surface over soft ground. The trackway runs on a north-east to south-west orientation, is just under two metres wide at 1.95 metres, and survives to a depth of around 0.2 metres. The timbers are predominantly alder and hazel, with some birch also present, all species that would have been readily available in the wet woodland fringing the bog. Corlea is already well known for its Iron Age road, dated to 148 BC and now partially displayed in a dedicated interpretive centre nearby, and this togher belongs to a wider landscape of ancient wetland engineering that accumulated over millennia in the same terrain.

The bog itself has acted as an accidental archive, its acidic, oxygen-poor conditions slowing decay and holding organic material in a way that dry land rarely does. Wooden roads that would have rotted away within decades on ordinary soil can survive here for thousands of years, their timbers sometimes still flexible when first uncovered. Visiting the Corlea Trackway Interpretive Centre in Keenagh gives access to the broader story of these wetland roads, and the preserved section on display there offers a sense of the scale and craftsmanship involved, even if this particular class 3 togher remains below the surface of the surrounding bog.