High Quality Content by WIKIPEDIA articles! The Inner German border (German: innerdeutsche Grenze or deutsch–deutsche Grenze; initially also Zonengrenze) was the frontier 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 but physically separate Berlin Wall, the border was 1,393 kilometres (866 mi) long and ran from the Baltic Sea to Czechoslovakia.