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World River System – Overview

UPSC | SSC | Geography | Prelims + Mains

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What is a River System?

A river system consists of a main river and its tributaries, forming a drainage network across a region.

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 Major River Systems of the World

• Nile – Africa (Longest river)
• Amazon – South America (Largest by discharge)
• Mississippi–Missouri – North America
• Yangtze – China (Longest in Asia)
• Danube – Europe (International river)

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 Types of Rivers

• Perennial Rivers → Flow throughout the year
• Seasonal Rivers → Flow mainly during rainy seasons

 Key Components

• Source → Origin of the river
• Course → Path of flow
• Mouth → Where it drains (sea/ocean)

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🎯 Exam Importance

• Map-based questions
• Longest vs Largest rivers
• River–continent–ocean linkage

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