Rožmberk nad Vltavou is a town in Český Krumlov District in the South Bohemian Region of the Czech Republic. It has about 400 inhabitant…Rožmberk nad Vltavou is a town in Český Krumlov District in the South Bohemian Region of the Czech Republic. It has about 400 inhabitants. The urban area with Rožmberk Castle is well preserved and is protected by law as an urban monument zone.