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What is the principal headstream of the Mekong River called?
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Mekong River
The Irrawaddy and Mekong river basins and their drainage networks.
The principal headstream of the Mekong River is called the Za Qu River. It originates on the north slope of the Tanggula Mountains in Qinghai province, China, at an elevation exceeding 16,000 feet (4,900 meters).1