a river of Germany, the most considerable of the left bank tributaries of the Oder; it rises at an altitude of 24 4 0 ft., on the northern (Silesian) side of the Riesengebirge. In its upper course it traverses a higher plateau, whence, after passing the town of Landeshut, it descends through a narrow and fertile valley to Kupferberg. Here its romantic middle course begins, and after dashing through a deep ravine between the towns of Hirschberg and Ldwenberg, it gains the plain. In its lower course it meanders through pleasant pastures, bogland and pine forests in succession, receives the waters of various mountain streams, passes close by Bunzlau and through Sagan, and finally, after a course of 160 m., joins the Oder at Crossen. Swollen by the melting of the winter snows and by heavy rains in the mountains, it is frequently a torrent, and is thus, except in the last few miles, unnavigable for either boats or rafts.