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 other states there are the following subdivisions: The most populous state of North Rhine-Westphalia is uniquely divided into two area associations ("Landschaftsverbände"), one for the Rhineland, and one for Westphalia-Lippe. This arrangement was meant to ease the friction caused by uniting the two culturally different regions into a single state after World War II. The "Landschaftsverbände" now have very little power. The constitution of Mecklenburg-Vorpommern at §75 states the right of Mecklenburg and Vorpommern to form "Landschaftsverbände", although these two constituent parts of the state are not represented in the current administrative division. The large states of Baden-Württemberg, Bavaria, Hesse,