Geography The Red River begins in China's Yunnan province in the mountains south of Dali . It flows generally southeastward, passing through Dai ethnic minority areas before leaving China through Yunnan's t Honghe Autonomous Prefecture . It enters Vietnam at Lào Cai Province . It forms a portion of the international border between China and Vietnam. Once reaching the lowlands near Viet Tri, the river and its distributaries spread out to form the Red River Delta . The Red River flows past the Vietnamese capital Hanoi before emptying into the Gulf of Tonkin . Tonkin is the former name of the northern provinces of Vietnam and thus the eponymous body of water receiving the main river of "Tonkin". Black river Lo river The Red River delta is about 120 km long and 140km wide, and is expanding an astonishing 100 metres a year. It is the economic centre of northern Vietnam - Haiphong, Vietnam’s main port, lies on a branch of the delta. The volume of water flowing down the river averages 500 million cubic meters per second, but may
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