A pond barrow is a circular depression, the material from which has been placed around the circumference to form an embanked rim. Within the enclosed central area there may be pits and/or shafts, some of which contain burials, and some of which can be of great depth. In diameter pond barrows range from about 5m to 30m across. Most are recognized as upstanding earthworks, but ploughed examples can be identified from cropmarks or soilmarks on aerial photographs.