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Neisse(nīs`ə), two rivers of SW Poland. The Glatzer Neisse (glät`sər), Pol. Nysa Kłodzka, c.120 mi (190 km) long, rises in the Sudetes, SW Poland, and winds generally NE past Kłodzko to the Oder River near Brzeg. A large dam at Otmuchow serves hydroelectric and irrigation projects. The Lausitzer Neisse (lou`zĭt'sər) or Lusatian Neisse (lo͞osā`shən), Czech Lužická Nisa, Pol. Nysa Łużycka, c.140 mi (230 km) long, rises in the Sudetes, N central Czech Republic, and flows generally N to the Oder River near Guben, Germany. Since 1945 it has formed part of the border between Germany and Poland. Görlitz, Germany, is the chief city on the river. It is also known as Görlitzer Neisse.
(Polish, Nysa Łużycka; Czech, Lužická Nisa), a river in Western Europe, a left tributary of the Oder (Odra). The river is 256 km long and drains an area of 4,200 sq km. Rising on the southern slopes of the Jizerské Hory in Czechoslovakia, it flows along the western edge of the Sudetes and enters a plain below Görlitz. There are freshets, and the average discharge is about 30 cu m per sec. The largest cities along the river are Liberec in Czechoslovakia, Zittau and Görlitz in the German Democratic Republic, and Gubin in Poland. The river is navigable as far as Gubin. The Neisse forms a large part of the boundary between Poland and the German Democratic Republic.