It is a togher, a term for a timber trackway laid across wet or waterlogged ground, and this particular example falls into what archaeologists classify as class 3, a category covering relatively simple constructions of brushwood, poles, or loosely arranged timbers rather than the more elaborate mortised plank roads found elsewhere in Irish bogland. The peat that swallowed it also preserved it, keeping the organic material in a state of suspended decay for potentially thousands of years.

The site came to light during a field survey in 1988, noted by B. Raftery, one of the foremost scholars of Irish bog roads and Iron Age archaeology. Toghers as a category range enormously in age and ambition, from Neolithic pathways to early medieval causeways, and their construction reflects a persistent practical need to move people, animals, and goods across the saturated midland landscape that would otherwise have been impassable for much of the year. The Irish midlands are particularly rich in such remains precisely because the blanket bogs that formed over millennia here created ideal preservation conditions, sealing timber under low-oxygen, acidic layers of compressed vegetation. Derrynaskea sits within that broader midland context, its togher one of many such features that collectively suggest a pre-drainage countryside threaded with wooden pathways now largely invisible above ground.