How do the Oder and Lusatian Neisse rivers form part of the border between Poland and Germany?

The Oder and Lusatian Neisse rivers form a significant portion of the border between Poland and Germany. This boundary, known as the Oder-Neisse Line, was established by the Allied powers at the end of World War II.1

The line extends southward from the Baltic Sea near Świnoujście, passing west of Szczecin. It then follows the Oder River until it meets the Lusatian Neisse River south of Frankfurt. From this confluence, the border continues along the Lusatian Neisse River to the Czechoslovakian border. The Oder River itself forms the boundary between Poland and Germany for approximately 116 miles before reaching the Baltic Sea. The Lusatian Neisse is the more westerly of two rivers named Neisse, and it forms part of the German-Polish frontier.123