European watershed area of the Rhine, which empties into the North Sea via the Netherlands, and the Danube, which flows eastward emptying into the Black Sea. It enters Austria at Piz Buin in the Silvretta Alps running along the Arlberg massif and forming the border between the states of Tyrol and Vorarlberg. It reaches Bavaria, Germany via the crest of the Allgäu Alps and leaves the High Alps at the Adelegg range near Kempten. Within the Alpine foothills it runs north of the Schussen catchment area of Lake Constance towards the sources of the Brigach and Breg headwaters of the Danube in
Vorarlberg the Swiss French in the 19th century by invitation during the days of the Austro-Hungarian Empire. There has been a sizable minority of Turkish descent since the 1960s. 78% of the population are Roman Catholic, which puts Vorarlberg in line with the national Austrian average of 73.6%. The second-largest denomination, with a share of 8.4%, is Islam, mostly Turks. 7,817 (or 2.2%) of Vorarlberg's inhabitants are Protestants. For several years, the Vorarlberg economy has been performing well above the Austrian average. While the overall Austrian GDP in 2004 rose by 2.0% in real terms, Vorarlberg recorded an increase of 2.9%.