Karlovy Vary is a spa town situated in western Bohemia, Czech Republic, on the confluence of the rivers Ohře and Teplá, approximately 130 km west of Prague (Praha). It is named after Charles IV, Holy Roman Emperor and King of Bohemia, who founded the city in 1370. It is the site of numerous hot springs (13 main springs, about 300 smaller springs, and the warm-water Teplá River), and is the most visited spa town in the Czech Republic. Until 1945, when the German-speaking inhabitants were expelled, the town was overwhelmingly German speaking for most of its history. The city has approximately 48,500 inhabitants.