Beneath a stretch of Co. Kildare bog, invisible to anyone crossing it on foot, lies a road. Not a rough track of thrown-down timber, but a properly engineered roadway, 4.5 metres wide, built from marl and gravel, and sealed under nearly two metres of peat. It has been there long enough for the bog to swallow it entirely, leaving only a faint line of coarse grass on the surface as its signature.

The road sits on the eastern edge of a large expanse of bog near Barnaran, and appears to have served as a crossing point giving access to Lullymore, an area of higher ground roughly 1,300 metres to the north. Lullymore, rising above the surrounding wetland, would have functioned effectively as an island in a landscape dominated by bog and marsh, and roads like this one, known as toghers, were the practical solution to reaching such places. A togher is essentially a causeway through bogland, built to allow movement across terrain that would otherwise be impassable. This particular example was excavated by Rynne in 1964 and 1965, working on behalf of the National Museum of Ireland. Rynne investigated the road's southern end, where it ran close and parallel to a modern tarred road, and found the structure lying just 0.55 metres below the bog surface, with at least 1.85 metres of peat beneath it. Its course could be traced for around 300 metres. A second, comparable roadway is known to lead northward from Lullymore itself, and at least two further toghers have been recorded in the surrounding area, suggesting the island was once approached from several directions, connected to the wider landscape by a small network of engineered routes now largely absorbed into the bog.