Oranienburg (ōräˈnyənbŏrkh) [key], city (1994 pop. 28,320), Brandenburg, NE Germany, on the Havel River. It is a center of a fruit-growing region. Manufactures include chemicals and steel products. Oranienburg was the site of one of the earliest concentration camps (est. 1933) set up by the National Socialist (Nazi) regime.

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