33. Which is called the world's most international river because it passes through 10 Central and Eastern European countries from the Black Forest to the Black Sea? a. The Volga b. The Rhine C. The Danube d. The Thames

The correct answer is c. The Danube.<br /><br />The Danube River is known as the world's most international river because it flows through 10 countries in Central and Eastern Europe, from the Black Forest in Germany to the Black Sea in Romania. The Volga River is the longest river in Europe and flows entirely within Russia. The Rhine River flows through several countries in Western Europe, but not as many as the Danube. The Thames River is a major river in England and does not flow through multiple countries.