The Danube was once a long-standing frontier of the Roman Empire, and today flows through 10 countries, more than any other river in the world.
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The longest river in the world is the Nile River in Africa and the length is 6,690 km. The biggest river in the world in terms of amount of water and flow of water would be the Amazon River in South America.
Congo is the only major river which crosses the equator twice. It is the second largest river in Africa after Nile and the second largest river in the world. Congo has a total length of 4,370 km and area about 4,000,000 km sq . Was this answer helpful?