What makes this place quietly arresting is that the walls do not stop at the shoreline. Investigated by a researcher named Kilbride in 1868, they were found to extend beneath the high-water mark and out into An Trá Mhór, the tidal inlet that borders the site to the west and south. In other words, the land these walls once organised is now partly underwater, a detail that suggests either dramatic coastal change over time or a sea level considerably lower when the walls were first laid down.

The walls themselves are built of the same grey limestone that defines the Aran landscape, set directly onto bedrock rather than any prepared foundation. When portions were examined in November 1984, sections roughly two metres wide and at least thirty centimetres high were still protruding from the sand along the south-eastern shore of the inlet. Work carried out as part of the AranLIFE Farming Project between 2014 and 2018 added further detail: the walls follow a roughly north-south alignment, with cross-walls running east to west, suggesting a deliberately organised field pattern rather than casual enclosure. Additional traces have appeared in blowouts and gullies in the dunes to the south of An Trá Mhór, where wind erosion periodically uncovers what the sand had buried. Nearby, at the north-eastern tip of the promontory in an area called Barr na Coise, there is also a stone enclosure and a clochan, a small dry-stone beehive hut of a type associated with early medieval monastic and agricultural settlement in Ireland.

The site is most legible at low tide, when wall sections within the inlet itself become visible, and after episodes of wind erosion that open fresh windows in the dune surface. The combination of submerged walls, shifting sand, and the spare geometry of the surviving stonework gives the place an atmosphere quite different from the well-visited forts further north on the island.