River Derwent

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River Derwent is the name of several rivers in England:

The name "Derwent" means "a valley thick with oaks" (compare Modern Welsh derwen = oak). The Romans had an encampment called Derventio on the banks of the Derwent at what is now Derby. The Roman spelling was Darwent. The Derwent Reservoir is located at the Derwent Valley, downstream of the Howden Reservoir. The river flows on through Derby.