What is the name of the post-World War II border between Germany and Poland?

The post-World War II border between Germany and Poland is called the Oder–Neisse line.

It generally follows two rivers: the Oder and the Lusatian Neisse. The line runs from the Baltic Sea in the north toward the Czech Republic and became Poland’s western boundary after Germany’s defeat in 1945.

The border was discussed by the Allied powers during the final years of World War II and placed much of Germany’s former eastern territory under Polish administration. Poland, in turn, lost eastern territories to the Soviet Union. The population changes that followed included the expulsion and flight of millions of Germans and the resettlement of many Poles.

East Germany recognized the line in the 1950 Treaty of Zgorzelec. West Germany initially refused to accept it as final, though it recognized the border in a 1970 treaty. Reunified Germany and Poland confirmed it in the 1990 German–Polish Border Treaty, ratified in 1992. The Maginot Line was a French defensive system, not a postwar border.