Capital of the state of Salzburg, W Austria, on the river Salzach, in W Austria; population (1981) 139,400. The city is dominated by the Hohensalzburg fortress. It is the seat of an archbishopric founded by St Boniface about 700 and has a 17th-century cathedral. Industries include stock rearing, dairy farming, forestry, and tourism. It is the birthplace of the composer Wolfgang Amadeus Mozart and an annual music festival has been held here since 1920. 2. Federal province of Austria; area 7,200 sq km/2,779 sq mi; population (1987) 462,000. Its capital is Salzburg.