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the upper Thames Estuary was later shortened by the Thames and Medway Canal, although this route, too, was abandoned.

In various warm years the incidence of "marsh fever" (malaria) was extremely high. Since the removal of livestock from marshy areas, the number of native mosquitoes has greatly declined, and Britain's last recorded outbreak of malaria was in 1918.

Yantlet Creek at the south of the Yantlet Line was the downstream limit of the City of London's

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