The inner-German border (also known as the German-German border), which is almost 1,400 kilometers long, prevented the inhabitants of the German Democratic Republic from visiting the Federal Republic of Germany or leaving it permanently in the west until 1989 due to massive fortifications.
It did not include the part of the GDR border with Berlin whose western sectors within Berlin were blocked off by the Berlin Wall from 1961.
The course of the demarcation lines between the western zones of occupation and the Soviet zone of occupation (SBZ) was determined by the victorious powers of World War II in several conferences and continued in this geographical form after the founding of the two German states in 1949.
The border began in the south at the border triangle of Bavaria, Saxony / GDR, Czechoslovakia and ended at the Baltic Sea in Lübeck Bay on the Priwall peninsula.
During the Cold War, it was part of the Iron Curtain, both militarily and geopolitically.
Since November 1989, after the fall of communism and the peaceful revolution in the GDR, it has been dismantled and transformed into a special eco-zone as a green belt between parts of Europe.
(Source: Wikipedia)