Earthworks of a former probable early post-medieval duck decoy pond, to the east of Welton le Marsh. The feature is visible as a series of three concentric curved ditches, running for 110m at the maximum, and appearing to be attached to the main drain. They were thought to be drains, enclosing a central pond or marshy area, measuring roughly 20m by 15m, and designed to attract ducks. Identified on aerial photography examined as part of the National Mapping Programme. {1} The feature had been noted as extant earthworks in 1959, though now appears to be largely ploughed level, as seen on the Google Maps satellite imagery layer. It does still appear as very faint earthworks on recent LiDAR data for this area however, and likely still survives as below-ground archaeological deposits. The feature is not depicted on any historical Ordnance Survey map editions for this area, suggesting it was no longer in use by the time of the first detailed surveyd in the late 19th century. {2}{3}{4}