River Oder

The Oder is a river in Central Europe that rises in the Czech Republic and flows 742 kilometres through western Poland and then forms part of the border between Poland and Germany before emptying into the Szczecin Lagoon and then into the Baltic Sea. It is Poland's second-longest river in total length and drains a basin of 119,074 square kilometres, with 89% of this area located in Poland. The river is navigable over a large part of its length and passes through several major cities, including Wrocław and Szczecin, before emptying into the Baltic Sea.learn more on wikipedia