It is about four metres long and two and a half metres wide, modest in every physical sense, yet the deliberateness of its construction makes it difficult to dismiss as anything accidental or natural.

The feature is understood to be a causeway, and its position is telling. It sits at the nearest point on the shoreline to a crannog recorded roughly sixty metres to the north-north-east. A crannog is an artificial or partly artificial island, typically built from timber, stone, peat, and brushwood, and used as a dwelling place from the Bronze Age through to the early modern period in Ireland and Scotland. The causeway almost certainly served as the connection between the mainland and that island platform, allowing people, animals, and goods to move across the water. Whether it was submerged by a gradual rise in lake levels over the centuries or was deliberately kept just below the surface as a security measure, a common feature of crannog design, is not recorded. Its presence was noted by Crumlish in 1996.