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The Opava (Czech: Opava, Polish: Opawa, German: Oppa) is a river in the north-eastern Czech Republic, a left tributary of the Oder river. It is over 119 km long, with some 25 km forming the border with Poland. Moravian-Silesian Region (Czech: Moravskoslezský kraj), or Moravo-Silesian Region, is an administrative unit (kraj) of the Czech Republic, located in the north-eastern part of its historical region of Moravia and in most of the Czech part