Ústí nad Labem (ōsˈtyē näd läˈbĕm) [key], Ger. Aussig, city (1991 pop. 100,002), NW Czech Republic, in Bohemia, on the Elbe and Bilina rivers and near the German border. It is a river port, railroad hub, and industrial center in a lignite-mining area. The city has chemical, textile, and food-processing industries. Founded in the 13th cent., Ùstí nad Labem was ceded to Germany in 1938 by the Munich Pact but reverted to Czechoslovakia in 1945. In the city are several Gothic and Renaissance churches.