That designation alone is worth pausing over. Field boundaries rarely announce themselves as objects of historical interest; they tend to fade into the landscape, taken for granted as the bones of agricultural life. Yet the boundaries that survive in the west of Ireland can be among the most enduring traces of human settlement on the island, sometimes marking divisions of land that predate written records by centuries.

The Irish place name offers some orientation. Doire means an oak wood or grove, and Béal An Mháma translates roughly as the mouth or entrance of the mountain pass. The name situates the place in a particular kind of landscape, one defined by upland terrain and the movement of people and animals through it. Field boundaries in such areas were rarely incidental constructions. Built from stone cleared from the land itself, they served to define ownership, contain livestock, and demarcate cultivated ground from rough grazing. Some boundaries in Connacht have been traced back to the Bronze Age, their lines preserved beneath layers of blanket bog before being exposed again by erosion or turf cutting. Whether this particular boundary belongs to any such early phase remains, for now, an open question.