Eastern Neisse

Eastern Neisse (Nysa Kłodzka)
Nysa Kłodzka in Kłodzko
Oder basin, Nysa Kłodzka in red
Location
Country	Poland
Region	Lower Silesian Voivodeship, Opole Voivodeship
Physical characteristics
Source
• location	Jodłów, Lower Silesian Voivodeship, Poland
• coordinates	50°9′53″N 16°47′20″E / 50.16472°N 16.78889°E / 50.16472; 16.78889
• elevation	1006 m
Mouth	Oder
• location	Rybna, Opole Voivodeship, Poland
• coordinates	50°49′9″N 17°39′30″E / 50.81917°N 17.65833°E / 50.81917; 17.65833
• elevation	139 m
Length	189 km (117 mi)
Basin size	4,570 km2 (1,760 sq mi)
Discharge
• location	mouth
• average	37.7 m3/s (1,330 cu ft/s)
Basin features
Progression	Oder→ Baltic Sea

The Eastern Neisse,^[1] also known by its Polish name of Nysa Kłodzka (German: Glatzer Neiße, Czech: Kladská Nisa), is a river in southwestern Poland, a left tributary of the Oder, with a length of 188 km (21st longest) and a basin area of 4,570 km² (3,742 in Poland).^[2]

Prior to World War II it was part of Germany. During the Yalta Conference it was discussed by the Western Allies as one possible line of the western Polish border. Attempts were made to negotiate a compromise with the Soviets on the new Polish-German frontier; it was suggested that the Eastern Neisse be made the line of demarcation. This would have meant that (East) Germany could have retained approximately half of Silesia, including most of Wrocław (formerly Breslau). However the Soviets rejected the suggestion at the Potsdam Conference and insisted that the southern boundary between Germany and Poland be drawn further west, at the Lusatian Neisse,^[3][1] in some way reintroducing the border to the place from the beginnings of Polish statehood, i.e. west of Legnica Town, important for Bolesław IV the Curly and Henry the Bearded, two Polish Princepses.^[4][5]