A sub-circular enclosure, visible as cropmarks and soilmarks on recent air photographs. The enclosure is bisected by the parish boundary between Cadney (North Lincolnshire) and Somerby (West Lindsey, Lincolnshire). It may be late prehistoric. The enclosure measures about 190m by 175m across and no internal features are visible. On the eastern, Lincolnshire, side the enclosure ditch is visible as a broad, diffuse soilmark up to 24m wide. On the North Lincolnshire side the ditch is not visible on the aerial photograph, but a semicircular patch of greener vegetation marks the extent of the enclosure. A young woodland plantation is currently (2013) growing on this part of the monument. The enclosure is visible as a shallow earthwork on recent Environment Agency LiDAR survey data. {1}{2}