The Black Deep begins in open sea east of Foulness Point and south of Clacton-on-Sea and is bounded by two substantial sandbanks, the Sunk Sands to the north-west and the Long Sands spread out to the south and east (which have some wind turbines).
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A rumour current in the sixteenth century, repeated by the chroniclers John Rastell and Edward Hall, by a continuer of John Hardyng's chronicle and subsequently by John Speed, suggested that Richard III, aided by the priest of Sir Robert Brackenbury, had disposed of the bodies of the murdered Edward V of England and Richard of Shrewsbury, 1st Duke of York in the Black Deep, "whereby they should never rise up, or be any more seen".
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Their task was to remove London's sludge waste from Beckton and Crossness for disposal on the ebb tide at sea, at Black Deep, an extremely deep part of the North sea located fifteen miles off Foulness, on one of the main approaches to the Thames Estuary.