Buried in the wetland at Derrylough, it is barely a metre wide and only ten centimetres deep, yet it represents a remarkably specific piece of ancient engineering, laid down by people who needed to cross ground that would otherwise have swallowed them.

The structure is a togher, the Irish term for a bog road or trackway, built by laying timbers across soft or waterlogged terrain to create a firm surface underfoot. This particular example is classed as a class 3 togher, meaning it is relatively simple in construction: a scatter of transverse hazel roundwood, each piece no more than seven and a half centimetres in diameter, laid side by side across the line of travel. The trackway runs east to west and measures just under a metre in width, wide enough for a person, perhaps a laden animal. Hazel was a common choice for such work, being flexible, reasonably durable, and available in managed woodland through a practice called coppicing, where cut stems are encouraged to regrow as straight rods. The choice of material and the informal, scattered arrangement of the timbers place this in the less monumental end of the togher spectrum, a practical, local solution rather than a major communal undertaking.