Duisburg

River port and industrial city in North Rhine-Westphalia, Germany, at the confluence of the Rhine and Ruhr rivers, 20 km/12 mi northwest of Düsseldorf; population (2003 est) 513,400. It is the largest inland river port in Europe. Located at the western end of the Ruhrgebiet (Ruhr District), Duisburg possesses the major Rhine docks at Ruhrort through which raw materials, such as iron ore and petroleum are imported. It has the largest concentration of heavy industry (iron and steelmaking, oil refining, heavy engineering, chemicals, and barge building) in the Ruhr. One of the world's longest span truss bridges, the Duisburg-Neuenkamp Bridge, stretches 350 m/1,148 ft across the Rhine.