States of Austria arable terrain. The other five states, in contrast, are located in the Alps and thus are comparatively unsuitable for agriculture. Their terrain is also relatively unfavourable to heavy industry and long-distance trade. Accordingly, the population of what now is the Republic of Austria has been concentrated in the former four states since prehistoric times. Austria's most densely populated state is the city-state of Vienna, the heart of what is Austria's only metropolitan area. Lower Austria ranks only fourth with regard to population density even though it contains Vienna's suburbs; this is due to large areas of land being predominantly agricultural.
States of Germany East Germany's capital and its 15th district. Just prior to the German reunification on 3 October 1990, the East German states were reconstituted close to their earlier configuration as the five "New States". The former district of East Berlin joined West Berlin to form the new state of Berlin. Henceforth, the 10 "old states" plus 5 "new states" plus the new state Berlin add up to current 16 states of Germany. Later, the constitution was amended to state that the citizens of the 16 states had successfully achieved the unity of Germany in free self-determination and that the Basic Law