Colchester is a local government district and borough in Essex, England, named for its main town, Colchester. The borough covers an area of 125 square miles and stretches from Dedham Vale on the Suffolk border in the north to Mersea Island on the Colne Estuary in the south.
The borough was formed on April 1, 1974 by the merger of the former borough of Colchester with the urban districts of West Mersea and Wivenhoe, along with Lexden and Winstree Rural District.
