Regensburg is a city located in eastern Bavaria, Germany. It sits at the confluence of the rivers Danube, Naab, and Regen, marking the northernmost point of the Danube river. The city serves as the capital of the Upper Palatinate subregion.
With a population exceeding 150,000 inhabitants, Regensburg is the fourth-largest city in the state of Bavaria, following Munich, Nuremberg, and Augsburg. It also ranks as the eighth-largest city along the Danube river. Historically founded as an imperial Roman river fort, it has served as a primary political, economic, and cultural center for its surrounding region.
During the era of the Holy Roman Empire, the city was notable for housing the Perpetual Diet of Regensburg.