The earthwork remains of a D-shaped mound, possibly a medieval saltern mound, located adjacent to a small dry creek in Cliffe Marshes at TQ 74627763. The mound measured approximately 10m x 16m with traces of a slight ditch encircling the mound, linking into the dry creek. The mound was seen as an earthwork on aerial photographs taken in 1953, and could be seen as a cropmark, possibly with some remaining height, on Google Earth imagery taken in 2007.

Saltern mounds are the result of large-scale salt manufacturing where brine was extracted from salt-rich sands and sediments, concentrated and evaporated using process known as sleeching. The discarded waste material from the process built up around the production area into a sizeable mound, often with a hollow in the centred where a hut stood. These medieval saltern mounds are typically described as floriate in form because of their irregular lobed formation of dumped waste. They often occur in clusters around former and surviving tidal water-courses within the marsh. There has been considerable reclamation and subsequent sea wall construction since the medieval period which has isolated these sites from the sea.

Many of these mounds were subsequently utilised as sheepfolds, sheep washes and stock refuges in the post medieval period because of their slightly elevated position in the readily flooded marshes.

Roman finds have been extracted from some of these sites, but are believed to be from the lower levels, and not associated with the mounds. Post-Roman flooding and silt deposition has resulted in Roman sites lying typically several feet below the current land surface.

This site was mapped from aerial photographs as part of the English Heritage: Hoo Peninsula Landscape Project. (1-2)

<1> RAF, 1953, NMR/RAF/713 0452 06-FEB-1953 (Photograph). SKE57178.