1. The Mackenzie River, which drains much of northern Canada.

2. The Orinoco River.

3. Second, at 3990 miles, behind the Nile River at 4132 miles)

4. The Congo River.

5. The Zambezi River, in eastern Africa.

6. The Rhone or the Ebro. Much of Europe's Mediterranean coast is covered in mountains, which means that most of its rivers flow the other direction.

7. The Danube, which flows into the Black Sea.

8. The Yellow River, in China.

9. The Ganges River.

10. The Murray River.