Upright stone slabs protrude just a few centimetres above the surface of the peat at Tuar Sáilín, the exposed tips of field walls that were already old when the bog began to form over them. The walls run east to west and the longest visible stretch extends for around 16 metres, though how much more lies sealed beneath is unknown. The Owroe river runs south towards the Inny Valley, and mountains ring the site on the remaining sides, giving a sense of a place that was deliberately chosen, settled, and worked.

What makes the site particularly arresting is the relationship between the walls and the other features gathered around them. A fulacht fiadh, a type of prehistoric cooking site typically identified by its mound of fire-shattered stone and burnt soil, sits directly on top of one of the walls, meaning the cooking site came after the field system, and both predate the bog. The fulacht fiadh here is horseshoe-shaped, measuring roughly 11.4 metres north to south and 12.5 metres east to west, standing to a height of 1.65 metres. Its open side faces northwest, where a rectangular depression in the mound, around 5.5 metres by 2.8 metres, marks where a trough would once have sat, heated stones dropped into water to cook meat or process other materials. A small stream runs along its western edge, the practical water source the process required. About 25 metres further west lie the remains of a circular hut, its walls roughly built from large slabs and measuring approximately 5.6 metres by 4.9 metres internally. Together these features, boundary walls, a cooking site, a dwelling, suggest a moment of settled, organised activity in this mountain valley, a moment the bog then covered and, in covering, preserved.