It is a togher, an ancient trackway constructed across wet or waterlogged ground, and this particular example survives as a narrow ribbon of carefully laid timber, just seventy centimetres wide and about twelve centimetres deep, threading its way from east-northeast to west-southwest through terrain that would otherwise have been impassable.

Toghers were essentially the planked boardwalks of early Ireland, engineered solutions to the chronic problem of crossing boggy ground. Builders would lay roundwood, the untrimmed branches and poles cut directly from trees, both across and along the line of travel to create a stable surface over soft earth. The Derrindiff togher follows this method closely, using roundwood laid in both transverse and longitudinal arrangements, with hazel forming the bulk of the material. Hazel was a practical choice: fast-growing, flexible, and available in abundance from managed woodland. The use of coppiced or cut hazel also tells us something about the people who built it, that they were working within a landscape they actively managed rather than simply foraged from. The precise age of this trackway is not recorded here, but toghers of this type found across the Irish midlands range from the Bronze Age through to the early medieval period, their preservation owed entirely to the anaerobic, oxygen-poor conditions of the surrounding peat.