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Olza (Czech Olše, German Olsa) is a river in Central Europe, right tributary of Oder. It flows from Silesian Beskides through northern Czech Republic and southern Poland. 86 kilometres, 1 100 km˛ of river basin.

See also:

History of Cieszyn and Těšín;
Cieszyn | Olza | Český Těšín;
Zaolzie | Duchy of Cieszyn | Silesia | Upper Silesia | Cieszyn Silesia