At An Inse Mhór, a network of curvilinear field boundaries, built from stone and now largely swallowed by peat, protrudes intermittently above the bog surface across a roughly rectangular area of about 180 metres east to west and 90 metres north to south. The walls themselves are modest, around 0.6 metres thick and only 0.3 metres high where they emerge, but their survival is quietly remarkable. In places, stone slabs are set at right angles to the wall line, a construction detail that hints at deliberate technique rather than simple rubble stacking. Where the ground dips into hollows or levels out, the walls sink back beneath the peat entirely, as though the landscape has been slowly reclaiming what was once organised, inhabited space.

What makes this more than an agricultural curiosity is the density of activity preserved within and around those boundaries. Associated with the field system are four hut sites, two enclosures, and a fulacht fia. A fulacht fia is a type of prehistoric cooking site, typically identified by a horseshoe-shaped mound of fire-cracked stones beside a trough or pit, thought to have been used for boiling water by dropping heated stones into it; they are found across Ireland in their thousands, mostly dating to the Bronze Age, and their presence here alongside habitation and enclosure suggests this hillside once supported sustained, organised occupation. The views from the slope reach across to Carrignaspirroge, and the whole complex sits in what is now rough hill grazing, the kind of terrain that tends to preserve what more intensively farmed lowland destroys. Bog, for all its inhospitability, is an exceptional archive.