Which European river flows through Vienna, Bratislava, Budapest, and Belgrade?
A) Rhine River
B) Seine River
C) Danube River
D) Po River
Answer: C) Danube River.
The Danube is a major European river that flows through or along the borders of 10 countries, directly passing through four national capital cities: Vienna (Austria), Bratislava (Slovakia), Budapest (Hungary), and Belgrade (Serbia). It is the second-longest river in Europe.