More on the South American rivers:

Amazon–Ucayali–Tambo–Ene–Apurímac. The river system, from Amazon River to Ucayali to Tambo to Ene and Apurímac river, is the longest river system in South America at 6,992km, with its drainage area spreading across the width of the South American continent at an area of 7 million square kilometers (largest drainage basin in the world!). The Amazon river system is also the second longest in the world, with the Nile River system pipping slightly ahead at 7,088km.

In terms of discharge volume, the Amazon river system is the largest in the world, discharging at 209,000m³/s onto the Atlantic Ocean.

Orinoco River. The Orinoco River is the second largest river by discharge volume of water at 33,000m³/s in South America, behind the mighty Amazon river which has the largest flow rate at 209,000m³/s. In terms of drainage area, Orinoco River (or Orinoquia) covers an area of 1,380,000km²stretching from Venezuela to Colombia and Guyana, fourth largest in South America.

The Madeira–Mamoré–Grande–Caine–Rocha river system has a drainage area of 1,485,200km², third-largest in South America, stretching across Brazil, Peru and Bolivia. It is also the third-largest river system by discharge volume at 31,200m³/s in South America, behind the Orinoco River and the Amazon River.

The Madeira–Mamoré–Grande–Caine–Rocha river system is home to a rich diversity of freshwater fish species, with close to 900 fish species estimated in the Madeira River Basin.

More lists on the world's longest and largest river systems:

World: Longest | Largest by Discharge Volume | Largest by Drainage Area

Europe: Longest | Largest by Discharge Volume | Largest by Drainage Area

Asia: Longest | Largest by Discharge Volume | Largest by Drainage Area

Africa: Longest | Largest by Discharge Volume | Largest by Drainage Area

Oceania: Longest | Largest by Discharge Volume | Largest by Drainage Area

North America: Longest | Largest by Discharge Volume | Largest by Drainage Area

South America: Longest | Largest by Discharge Volume | Largest by Drainage Area

Data: Ural

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