Cropmarks of a keyhole-shaped, ditched enclosure, to the north-east of Bett's Covert, South Willingham. Identified on aerial photography examined as part of the National Mapping Programme. The NMP photo interpreters were of the opinion that the cropmarks represented the remains of two conjoined Bronze Age round barrows. {1} Further analysis of the aerial photographs suggested that these cropmarks more likely represent the remains of a Neolithic long barrow, given the continuous oval-shaped nature of the cropmarks. The feature's location on the high shoulder of a natural spur also conforms with other known long barrows in this area. The cropmarks are visible as an elongated oval-shaped enclosure, aligned on a roughly north-west to south-east axis, and measuring 20m by 36m. The remains of a now largely flattened internal mound was visible as a compacted surface. {2}{3}{4}