Budapest, Ulm, and Linz are all cities located on the Danube River. BUDAPEST is the capital of Hungary and is the largest city on the Danube, with 8 letters in its name. Ulm is a city in Germany, located on the left bank of the Danube, with 3 letters in its name. Linz is the third-largest city in Austria, located on the Danube's northern bank, with 4 letters in its name. All three cities are important cultural and economic centers along the Danube River.