This is a togher, a type of trackway laid across wet or boggy ground to allow passage that would otherwise be impossible. The example at Derrindiff is classified as a class 3 togher, meaning it was a relatively substantial construction rather than a simple brushwood path thrown down in haste.

The trackway runs on a northeast to southwest orientation and measures two metres wide, which would have made it a practical and usable route rather than a token crossing. It was built using a combination of transverse and longitudinal ash roundwood, the pieces running both across and along the direction of travel, with half-split oak stems laid in and the whole structure held in place by wooden pegs. The ash timbers reach up to about ten centimetres in diameter. What makes the Derrindiff togher particularly telling is the presence of toolmarks on the wood. These are the direct physical traces of the people who felled, shaped, and laid the timber, evidence that the construction was deliberate and skilled rather than improvised. Toghers of this kind were often built to connect settlements, fields, or turf-cutting areas, and the bogs that once made them necessary have also been responsible for preserving them, the anaerobic, waterlogged conditions slowing decay over centuries or even millennia.