A togher is an ancient trackway built across wet or marshy ground, typically constructed from timber laid directly into the bog, and the example at Derrymany is a quietly remarkable piece of prehistoric or early medieval engineering preserved by the very waterlogged conditions that made it necessary in the first place.

The Derrymany togher runs on an east-west orientation and measures 2.3 metres wide and roughly half a metre deep, dimensions that suggest something more substantial than a simple footpath. It was built using longitudinal worked roundwood, trimmed timber pieces up to about 8.5 centimetres in diameter, laid alongside finer brushwood between 2.5 and 3.7 centimetres across. The materials used were hazel, birch, and ash, all native Irish species that would have been readily coppiced or gathered from nearby woodland. The combination of heavier structural timber with lighter brushwood is characteristic of careful, layered construction, designed to spread weight across unstable ground and keep the surface passable in conditions that would otherwise make travel impossible. Bogs were not marginal wastelands in early Ireland; they were boundaries, resources, and sometimes routes, and a togher like this one would have connected communities or facilitated the movement of livestock, goods, or people across terrain that would otherwise have been impassable for much of the year.