Chambered cairn, Swona
At the south end of the island (and noted on a map by Kirkwall librarian Mr E McGillivary) stand the remains of a prehistoric chambered cairn of the Orkney-Cromarty type, orientated east to west. Most of the cairn material has been lost to coastal erosion, but seven upright slabs are visible, some with gabled tops, the tallest 1.4 metres high. The remains suggest a stalled cairn some 16.5 metres long. It was noted by The Orcadian in 1903 that one of the uprights had many shells found at its base.