It is a togher, the Irish term for a timber trackway laid across soft or waterlogged ground, and the particular chemistry of peat bogs, acidic and low in oxygen, has preserved it long past any reasonable expectation.

This example runs east to west and measures 2.1 metres wide, shallow at just 0.1 metres deep. It was built from tightly packed brushwood, the individual stems averaging around two centimetres in diameter, the majority of them hazel. Hazel was a practical and common choice for this kind of work: it coppices readily, meaning it can be cut and will regrow, producing flexible, straight rods well suited to being bundled and pressed into boggy ground. Along the edges of the trackway, larger pieces of roundwood, up to roughly 9.5 centimetres in diameter, were laid as flanking timbers, helping to define the road's edges and hold the brushwork in place. The result is a modest but carefully constructed piece of early engineering, the kind of infrastructure that once allowed people and animals to move through terrain that would otherwise have been impassable.