Major River Drainage Basins
The world's principal catchment areas ranked by surface area, spanning continental divides and global hydrologic cycles.
Amazon Basin
The largest drainage basin in the world by surface area and discharge volume, covering approximately 40 percent of South America.
Congo Basin
The world's second-largest river basin by discharge and area, hosting the second-largest continuous tropical rainforest on Earth.
Nile Basin
Spans eleven sovereign nations across northeast Africa, connecting equatorial lake systems to the Mediterranean arid zone.
Mississippi River Basin
Drains 41 percent of the contiguous United States, stretching from the Allegheny Mountains to the Rocky Mountain crest.
Niger Basin
West Africa's boomerang waterway nurturing the semi-arid Sahel and Inner Niger Delta.
Yangtze Basin
Economic heartland of China hosting one-third of the nation's population and the Three Gorges Dam.
Ganges-Brahmaputra-Meghna Basin
One of the most densely populated river basins on Earth, containing the Sundarbans mangrove forest and Himalayan glacial headwaters.
Zambezi Basin
Southern Africa's premier wilderness and hydroelectric waterway, carving Victoria Falls.
Volga Basin
Europe's largest catchment area, feeding the endorheic Caspian Sea.
Indus Basin
The world's largest contiguous irrigation network, managed under the Indus Waters Treaty.
Murray-Darling Basin
Australia's agricultural food bowl, subject to extreme climatic drought and flood cycles.
Danube Basin
The most international river basin on Earth, touching 19 sovereign states across Central and Southeastern Europe.