An important German river, rises in Moravia, and crossing the frontier flows NW. through Silesia, and N. through Brandenburg and Pomerania 550 m. into the Stettiner Haff and so to the Baltic. On its banks stand Ratibor, where navigation ends, Breslau, Frankfort, and Stettin; it receives its chief tributary, the navigable Warthe, on the right, and has canal communication with the Spree and the Elbe.