Regensburg (German pronunciation: [ˈʁeɡənsbʊɐ̯k]; historically also Ratisbon, from Celtic Ratisbona, Latin: Castra Regina) (fr. Ratisbonne) is a city in Bavaria, Germany, located at the confluence of the Danube and Regen rivers, at one of the northernmost points of the Danube. Regensburg is the capital of the Bavarian administrative region Upper Palatinate.