The cropmark of a ring ditch has been identified to the south of the runway at Manston airport on Cottage Hill. This feature has been recorded in aerial photographs taken in 1979 and 1980, and again as part of a project to classify cropmarks across Kent by the Royal Commission on the Historic Monuments of England. The feature appears to be sub-circular with internal pit features, and may be the remains of a barrow. It is also possible that rather than comprising pit features the monument has been damaged by ploughing and only survives in poor condition.