Dornbirn is the largest city in Vorarlberg and the tenth largest in Austria. It is an important commercial and shopping centre.
Dornbirn is located in western Vorarlberg at 437 metres above sea level in the Rhine Valley, at the foot of the Karren mountain, part of the Bregenz Forest Mountain chain at the edge of the Eastern Alps. It is near the borders to Switzerland, Germany and Liechtenstein. The Dornbirner Ach river flows through the town and later into Lake Constance.