Because they use the rivers for trading and they use it for a source of energy...
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there are 88 rivers in south america
Most of Latin America's lakes and rivers are found in South America.
The longest river in South America is the Amazon. It travels through Colombia, Peru and Brazil for a distance of 4,000 miles. The source is the Nevado Mismi at an elevation of over 16,000 feet.
Amazon river
The rivers could bring salt supply, hydration to the land, and plentiful amounts of fish.