Duisburg is a city in the Ruhr metropolitan area of the western German state of North Rhine-Westphalia. Lying on the confluence of the Rhine and the Ruhr rivers, Duisburg is one of the largest cities in the Ruhr and the 15th-largest city in Germany.
In the Middle Ages, it was a city-state and a member of the Hanseatic League, and later became a major centre of iron, steel, and chemicals industries. For this reason, it was heavily bombed in World War II. Today it boasts the world's largest inland port, with 21 docks and 40 kilometres of wharf.