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How large is the Mekong River drainage basin?
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Mekong River
The Irrawaddy and Mekong river basins and their drainage networks.
The Mekong River drains a basin covering more than 313,000 square miles (810,000 square km) of land, extending from the Plateau of Tibet to the South China Sea.1
Approximately three-fourths of this drainage area is located within the four countries of the lower Mekong course: Laos, Thailand, Cambodia, and Vietnam.2