Würzburg is, after Nuremberg and Fürth, the third-largest city in Franconia located in the north of Bavaria. Würzburg is the administrative seat o…Würzburg is, after Nuremberg and Fürth, the third-largest city in Franconia located in the north of Bavaria. Würzburg is the administrative seat of the Regierungsbezirk Lower Franconia. It spans the banks of the Main river.