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Which countries does the Oder River flow through?

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The Oder River flows through three countries: the Czech Republic, Poland, and Germany.1

The river originates in the Czech Republic, where it flows for its first 70 miles. It then enters Poland, which contains the vast majority of its course. In its middle reach, the river serves as the border between Poland and Germany before it ultimately flows into the Baltic Sea via a lagoon near the Polish city of Szczecin.1