The second longest river emptying into the Baltic Sea, the Oder River flows northward from the Oder Mountains of the Czech Republic to form, with the Neisse River, the border between Poland and Germany. It is an economically important transport route, navigable for more than 700 km of its 903 km length, and connected by canal with the Vistula River and with western European waterways. Most of the river basin is densely populated lowland less than 200 m above sea level.

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