river of Europe, rises in Moravia, about 15 miles E. of Olmütz, flows N.E. to the confines of Prussia, then turns to the N.W., and flows generally in that direction as far as Oderberg in Brandenburg, where it turns to the N.E., and discharges its waters through the Grosse Haff into the Baltic. Its whole length is 550 miles; and it is navigable for vessels of 50 tons as far as Breslau, and for small boats up to Ratibor in Prussian Silesia. It receives from the right the Malapane, Bartsch, and Wartha; and from the left the Oppa, Silesian and Bohemian Neisse, Katzbach, and Baber. The principal towns on its banks are Breslau, Glogau, Frankfort, Custrin, and Stettin. This river is connected by canals with the Elbe, the Spree, and the Vistula.