      the derwent is a river in the county of derbyshire, england. it is  long and is a tributary of the river trent which it joins south of derby. for half its course, the river flows through the peak district. much of the river's route, with the exception of the city of derby, is rural. however the river has also seen many human uses, and between matlock and derby was one of the cradles of the industrial revolution, providing power to the first industrial scale cotton mills. today it provides a water supply to several surrounding cities, and its steeply sided valley is an important communications corridor through the uplands of the peak district.{{cite web | ur
Geography_of_Amber_Valley Rivers_and_valleys_of_the_Peak_District Rivers_of_Derbyshire Tributaries_of_the_River_Trent