The Nile, Amazon, Mississippi, Danube, river basins, and water systems.
Test your knowledge with these top questions!
Which river pours more water into the ocean than the next seven largest rivers combined?
The Amazon carries about a fifth of all river water reaching the sea, fed by vast rainforests.
Which river threads through or along ten countries, more than any other?
From Germany's Black Forest to the Black Sea, the Danube touches ten countries and four capital cities.
The world's largest power station dams which river?
China's Three Gorges Dam spans the Yangtze and out-produces every other power plant on Earth.
The Nile defies most river maps by flowing in which direction?
It drains toward the Mediterranean, which is why southern Egypt is called Upper Egypt.
What is the world's largest river basin by land area?
The Amazon basin spans about seven million square kilometers, an area approaching the size of Australia.
Into which body of water does the Mississippi River empty?
The Mississippi-Missouri system drains about 40 percent of the continental United States before reaching the Gulf of Mexico.
Which river carries the most water of any river in the world?
The Amazon discharges more water than the next seven largest rivers combined.
The Amazon River basin lies mostly within which country?
Roughly two-thirds of the Amazon basin sits inside Brazil, while its headwaters rise in the Andes.