This is a togher, the Irish term for a wooden trackway built through bogland, and the example recorded at Derrymany is a class 3 example, meaning it belongs to the simpler, less engineered end of a spectrum that ranges from rough brushwood paths to elaborately constructed timber roadways.

The Derrymany togher runs east to west and measures 1.12 metres wide and around 0.12 metres deep. It was constructed from hazel brushwood, each piece averaging about two centimetres in diameter, suggesting the kind of coppiced or gathered material that would have been readily available in early medieval Ireland. The brushwood was not evenly distributed: it was noticeably denser towards the centre of the trackway, which implies some deliberate shaping, perhaps to create a firmer walking surface where feet would most often fall. The hazel had been worked rather than simply gathered and dropped, meaning the builders cut and prepared the material rather than laying it as they found it. Toghers of this kind were typically built to connect areas of dry ground across otherwise impassable stretches of bog, and they speak to a landscape that was being actively managed and traversed rather than avoided.