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How much of Myanmar is drained by the Irrawaddy River and its tributaries?
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Irrawaddy River
The Irrawaddy and Mekong river basins and their drainage networks.
The Irrawaddy River and its tributaries drain approximately three-fifths of Myanmar’s total surface area. The river system, which flows entirely within the country, has a total drainage area of about 158,700 square miles (411,000 square km).12