The inner German border (German: Innerdeutsche Grenze [ˈɪnɐˌdɔʏtʃə ˈɡʁɛntsə] or Deutsch-deutsche Grenze [ˈdɔʏtʃˌdɔʏtʃə ˈɡʁɛntsə]; initially also Zonengrenze [ˈtsoːnənˌɡʁɛntsə]) 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 miles) long and ran from the Baltic Sea to Czechoslovakia.