It winds roughly east to west across a rough, east-facing slope at Derreenataggart Commons, about 75 metres of it still traceable above the surface, before sections slip quietly beneath the bog and vanish. A second wall branches off the western end, curving south and then south-east for around 95 metres. Together they describe a landscape that once had different purposes and different boundaries than anything visible today.

These are relict field boundaries, the kind of walls that speak to a period of land use long since abandoned. The base stones, some of them set upright at right angles to the wall line rather than laid flat, are embedded as deep as half a metre into the bog, which means the ground has gradually swallowed the lower portions over centuries. What survives above the surface stands only about 0.75 metres high and less than a metre wide, but the presence of the walls is less remarkable than what surrounds them. To the south lie two fulachtaí fia, a type of ancient cooking site typically identified by a horseshoe-shaped mound of fire-cracked stone and charcoal, thought to date from the Bronze Age. To the north sit a hut site, a burnt mound, and a third fulacht fia. The walls thread between these features, suggesting that whoever built or maintained the boundaries was moving through, and perhaps organising, a space already layered with older activity.

The bog has done what bogs do: preserved the lower stonework while obscuring the full extent of the walls, so that short sections simply disappear underfoot. Walking the line of either wall, you cross ground that holds a striking density of prehistoric remains within a small area, each feature catalogued and distinct, yet together forming something that feels less like an inventory and more like a neighbourhood, one that has been slowly sinking for a very long time.