It is a togher, an ancient trackway laid across wet or marshy ground using timber and brushwood, and the particular conditions of the bog, low oxygen, high acidity, have preserved it in ways that stone or mortar rarely manage. What survives here is a narrow path, just one and a half metres wide and roughly twelve centimetres deep, threading its way through the landscape on a northwest to southeast axis.

The construction is methodical rather than crude. The togher was built from interlaid hazel and alder brushwood, with thinner rods measuring between two and four centimetres in diameter laid both transversely and longitudinally, the two directions working together to spread weight and give the surface a degree of stability underfoot. Hazel and alder are well suited to this kind of work; alder in particular tolerates waterlogged conditions unusually well, making it a practical choice for anyone building across boggy ground. Crucially, the timbers show clear evidence of woodworking, meaning the material was not simply gathered and thrown down but shaped and prepared before being laid. That detail, small as it sounds, points to a considered engineering effort rather than a hasty crossing.