In the country's predominantly Alpine provinces, most of the population live in river valleys: Bregenz on the shores of Lake Constance in Vorarlberg; Innsbruck on the Inn River in Tyrol; Salzburg on the Salzach River in Salzburg; and Klagenfurt on the Wörthersee lake in Carinthia. The higher the Alps are, the less inhabitable they become in terms of soil, microclimate, and vegetation. Conversely, the lower and broader the Alpine valleys are, the more densely populated they become.