On the southern verge of that route, at a spot near Lettergesh, something once stood or was piled up that warranted marking on the first edition of the Ordnance Survey six-inch map as a small open circle. Today, no visible surface trace survives. The ground gives nothing away.

The symbol used on early OS mapping suggests this was likely a wayside cairn, a low mound of stones placed at the roadside, sometimes to mark a boundary, a death site, or a route across difficult terrain. What makes the Lettergesh example particularly intriguing is that it is not alone. Five other possible wayside cairns have been identified along the same road, suggesting this was once a corridor dotted with modest but deliberate markers, their original purpose now unreadable. The cluster points to a landscape that was once more legibly inscribed than it appears today, even if whatever meanings those cairns carried have since dissolved entirely into the bog and the Atlantic weather.