The Opava (-Czech: Opava, Polish: Opawa, German: Oppa) is a river in the north-eastern Czech Republic, a left tributary of the Oder river. Czech (ˈʧɛk čeština ˈʧɛʃcɪna in Czech is a West Slavic language with about 12 million native speakers it is the majority language in the Polish ( język polski, polszczyzna) is the Official language of Poland. The German language (de ''Deutsch'') is a West Germanic language and one of the world's major languages. "Riverine" redirects here For the use of that term in Maritime geography, see there The Czech Republic ( ˈt͡ʃɛskaː ˈrɛpuˌblɪka short form in Česko ˈt͡ʃɛskɔ also called Czechia, The Oder (known in Czech and Polish as Odra) is a River in Central Europe. It is over 119 km long, with some 25 km forming the border with Poland. Poland (Polska officially the Republic of Poland