Oberhausen ō´bərhou˝zən [key], city (1994 pop. 226,254), North Rhine–Westphalia, W Germany, a former industrial center of the Ruhr district. It is a port on the Rhine-Herne Canal and a rail junction. Chemicals are produced, and there are some light industries coal mining and iron and steel production, once significant industries, came to an end in the 1990s. The first German steam engine was built in Sterkrade, now a district of Oberhausen, in 1814. Oberhausen was chartered in 1874. An aquarium is in the city.

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