It appears with the quiet confidence of a surveyor who has noted something real and fixed. On the ground, however, the feature amounts to a gravelled lane sitting marginally higher than the surrounding terrain, heading out towards the bog before losing itself entirely. No continuation can be traced through the wetland beyond.

Causeways across Irish loughs and boggy ground occasionally turn out to be genuinely old structures, sometimes medieval or earlier, built to link islands to the shore or to provide a reliable crossing where the land offered none. This one resists that kind of romance. There is nothing in its character to suggest antiquity, and the honest conclusion is that it was probably a functional rural lane, given a grander name on the map simply because it crossed water at a narrow point. The 1837 Ordnance Survey was a remarkable project of documentation, but the surveyors recorded what they observed without always being in a position to judge age or significance. What they saw here was a raised crossing, and a causeway it became.