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(also Roer), a river in Belgium, the Federal Republic of Germany, and the Netherlands; a right tributary of the Meuse. It is 208 km long and drains an area of approximately 2,500 sq km. The Rur originates in the Hautes Fagnes upland. Its upper and middle courses, with well-developed meanders, flow through a forested valley. The lower Rur is regulated by dams. There are freshets in the winter and spring. The Rur is not navigable. The cities of Monschau, Düren, and Jülich (Federal Republic of Germany) are on the Rur, and the port of Roermond (Netherlands) is at its mouth.