In December 1989, only a month after the opening of the border, conservationists from East and West Germany met to work out a plan to establish a "German Green Belt" (Grünes Band Deutschland) stretching from the Baltic Sea to the Czech border.[191] The Bundestag voted unanimously in December 2004 to extend federal protection to the Green Belt and incorporate it into a "European Green Belt" being developed along the entire 6,800-kilometre (4,200 mi) length of the former Iron Curtain.