"The Inner German border (German: Innerdeutsche Grenze pronounced [ˈɪnɐdɔʏtʃə ˈgʁɛntsə] or Deutsch-deutsche Grenze pronounced [ˈdɔʏtʃˌdɔʏtʃə ˈgʁɛntsə]; initially also Zonengrenze pronounced [ˈtsɔnənˌgʁɛntsə]) was the border between the German Democratic Republic (GDR, East Germany) and the Federal Republic of Germany (FRG, West Germany) from 1949 to 1990. Not including the similar and physically separate Berlin Wall, the border was 1,393 kilometres (866 mi) long and ran from the Baltic Sea to Czechoslovakia.
It was formally established on 1 July 1945 as the boundary between the Western and Soviet occupation zones of former Nazi Germany. On the eastern side, it was made one of the world´s most heavily fortified frontiers, defined by a continuous line of high metal fences and walls, barbed wire, alarms, anti-vehicle ditches, watchtowers, automatic booby traps, and minefields. It was patrolled by 50,000 armed East German guards who faced tens of thousands of West German, British, and US guards and soldiers. In the hinterlands behind the border were more than a million North Atlantic Treaty Organisation (NATO) and Warsaw Pact troops." - (en.wikipedia.org 09.03.2020)
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