It leaves no mark on the grass, no rise or hollow underfoot. The only way it has ever been seen is from the air, where the buried outline of its fosse, a defensive or boundary ditch dug into the earth, shows up as a cropmark, a phenomenon that occurs when buried features affect how plants grow above them, producing subtle differences in colour or height that become legible only in aerial photographs.

The site is a ring-ditch, a type of prehistoric monument typically associated with funerary or ritual activity, though their precise original functions can vary. This particular example was identified through aerial photography catalogued under the Cambridge University Collection of Aerial Photographs reference BDO 74. Its dimensions are described as small, and its setting, on a slope angled toward the northeast with a river valley falling away sharply nearby, suggests a site chosen with some deliberate attention to the surrounding landscape, though the reasons behind that choice, like almost everything else about the monument, remain unrecorded.