Opava (; , , , , ) is a city in the northern Czech Republic on the river Opava, located to the north-west of Ostrava. The historical capital of Czech Silesia, Opava is now in the Moravian-Silesian Region and has a population of 59,843 as of January 1, 2005.
The Opava (, , ) is a river in the north-eastern Czech Republic, a left tributary of the Oder river. It originates at the confluence of Bílá (White), Střední (Middle) and Černá (Black) Opava in Vrbno pod Pradědem and runs over 119 km (74 mi) to the Oder at Ostrava, with some 25 km (16 mi) forming the border with Poland.
After the 1742 First Silesian War the Opava river in the Duchy of Troppau by the terms of the Treaty of Breslau 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.
Opava is city in the Moravian-Silesian Region, Czech Republic.
Opava may also refer to:
- Opava District, a district (okres) within Moravian-Silesian Region of the Czech Republic with capital at Opava
- Opava, Veľký Krtíš District, a village in the Banská Bystrica Region of Slovakia
- Opava (river), a river in the Czech Republic
- Duchy of Opava was a historic territory centered on the city of Opava