Which river is commonly cited as the longest river in the world?

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Multiple Choice

Which river is commonly cited as the longest river in the world?

Long measurements of rivers depend on where you start and how you trace the main channel to the sea. For much of modern history, careful surveys placed the Nile at about 6,650 kilometers, which made it the longest river in many textbooks and exams. Because the exact source of a large river can be hard to pin down and methods for measuring length differ, rankings can shift—some studies using different definitions have suggested other rivers might be longer. But in traditional reference sources and common exam contexts, the Nile has been the widely cited longest river, so it is the expected answer.

Long measurements of rivers depend on where you start and how you trace the main channel to the sea. For much of modern history, careful surveys placed the Nile at about 6,650 kilometers, which made it the longest river in many textbooks and exams. Because the exact source of a large river can be hard to pin down and methods for measuring length differ, rankings can shift—some studies using different definitions have suggested other rivers might be longer. But in traditional reference sources and common exam contexts, the Nile has been the widely cited longest river, so it is the expected answer.

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