The Amazon River: South America's Mighty Artery

The Amazon River is the pulsating heart of South America, the largest river by discharge volume in the world and the second longest after the Nile. Its vast basin covers nearly 40% of the continent.

Course and Countries

The Amazon flows eastward for approximately 6,400 km (4,000 miles) from its headwaters in the Peruvian Andes (Apurímac River) across the continent to the Atlantic Ocean. It traverses or forms borders of:

• Peru (source region)
• Bolivia (via tributaries like the Madeira)
• Colombia (southern tip, Leticia)
• Venezuela (via the Orinoco connection/Casiquiare canal)
• Ecuador (tributaries: Napo, Putumayo)
• Brazil (vast majority of its course and basin)

Hydrological Superlatives

• Discharge: ~209,000 m³/s (average)—more than the next seven largest rivers combined.
• Basin area: ~7 million km², spanning 7 countries.
• Tributaries: Over 1,100, including the Madeira, Negro, Japurá, Purus, Xingu, and Tapajós.
• Sediment load: ~1.2 billion tonnes/year, building the massive delta and Atlantic plume.

Ecological and Human Significance

The Amazon Basin hosts the world's largest tropical rainforest, unparalleled biodiversity (10% of known species), and over 30 million people, including 350+ indigenous groups. The river is a highway, larder, and spiritual center.

Threats include deforestation, mining pollution, hydroelectric dams, and climate change—making its conservation a global priority.

The Amazon is not just a river; it's a continental-scale life support system.