The walls were not discovered through deliberate excavation but through something far more mundane: turf-cutting. As local people worked the bog for fuel, they gradually uncovered a network of curvilinear field boundaries that had been quietly waiting below the surface, running between roughly 0.7 and 1 metre beneath the bog level.

The site lies on the southern side of a small tributary connecting Coomnacronia Lake with the Behy river, in a landscape shaped by exposed bedrock, scree, and gently sloping mountain ground. The walls themselves cover an area of approximately 340 metres by 230 metres. They are not the kind of neat, stacked-stone construction familiar from later Irish field systems; instead, they average about 30 centimetres wide and are built largely from upright boulders set into the ground. Each wall runs to around 30 metres in length, and their curvilinear form suggests an organic, incremental kind of land division rather than any formally planned layout. Crucially, no turf-cutting has yet reached the base of these walls, which means their full depth and extent remain unknown. What has been uncovered is, in all likelihood, only a partial picture.

Bog preservation of this kind is not unusual in Ireland. Blanket peat, which forms in wet, cool conditions over millennia, can seal organic and stone remains against the weathering that would destroy them at the surface. What makes this particular site quietly compelling is the ordinariness of how it came to light, and the certainty that more of it remains buried. The walls speak to a period when this now-marginal mountain landscape was actively divided, managed, and perhaps farmed, by people whose precise identity and era have not yet been established from what has been uncovered so far.