The Opava ( cs, Opava, pl, Opawa, german: Oppa) is a river in the north-eastern Czech Republic, a left tributary of the

Oder The Oder ( , ; Czech, Lower Sorbian and ; ) is a river in Central Europe. It is Poland's second-longest river in total length and third-longest within its borders after the Vistula and Warta. The Oder rises in the Czech Republic and flows thr ...

river. It originates at the confluence of Bílá (White), Střední (Middle) and Černá (Black) Opava in Vrbno pod Pradědem and runs over 110 km (69 mi) to the Oder at Ostrava, with some 25 km (16 mi) forming the border with Poland. Its basin area is about 2,090 km², of which 1,814 km² in the Czech Republic. After the First Silesian War, by the terms of the

Treaty of Breslau The Treaty of Breslau was a preliminary peace agreement signed on 11 June 1742 following long negotiations at the Silesian capital Wrocław (german: Breslau) by emissaries of Archduchess Maria Theresa of Austria and King Frederick II of Prussia ...

in 1742, the Opava in the Duchy of Troppau became the border between Austrian and Prussian Silesia (the later Province of Silesia). After World War I the demarcation was confirmed by the 1919 Treaty of Saint-Germain-en-Laye as the border between Czechoslovakia ( Czech Silesia) and the

Second Polish Republic The Second Polish Republic, at the time officially known as the Republic of Poland, was a country in Central Europe, Central and Eastern Europe that existed between 1918 and 1939. The state was established on 6 November 1918, before the end of ...

Towns

* Vrbno pod Pradědem * Krnov *

Opava Opava (; german: Troppau, pl, Opawa) is a city in the Moravian-Silesian Region of the Czech Republic. It has about 55,000 inhabitants. It lies on the river Opava (river), Opava. Opava is one of the historical centres of Silesia. It was a histori ...

* Kravaře * Ostrava

References

Rivers of the Moravian-Silesian Region Rivers of Poland Moravian-Silesian Region Rivers of Opole Voivodeship Czech Republic–Poland border International rivers of Europe Border rivers {{Poland-river-stub