This is a togher, the Irish term for a timber trackway laid across wet or boggy ground, and the example at Corlea is one of several such structures preserved beneath the anaerobic conditions of the midland bogs, where waterlogged peat slows the decomposition of organic material to something close to a standstill.

This particular togher is classified as a class 3 structure, meaning it was built from transverse roundwood and brushwood rather than the more elaborate split-plank construction seen in higher-class examples. The materials were birch and hazel, both common in the scrubby woodland that would have fringed the bog margins in antiquity. Running east to west, the trackway would have allowed people, animals, or loaded carts to cross terrain that was otherwise impassable, stitching together patches of drier ground across a landscape that was, in seasonal terms, frequently inundated. Corlea is already known for its remarkable Iron Age plank road, dated to 148 BC and now partially preserved and displayed at the Corlea Trackway Visitor Centre nearby, which gives some sense of how extensively this bogland was traversed and managed over many centuries. This more modest brushwood structure belongs to a quieter tradition of practical engineering, modest in ambition but no less telling about the daily demands of movement through the Irish midlands.