The Ma River (Vietnamese: Sông Mã, Lao: Nam Ma) is a river in Asia, originating in northwestern Vietnam. It runs for 400 km through Vietnam, Laos, and then back through Vietnam, meeting the sea at the Gulf of Tonkin.
The largest tributaries of the Ma River are the Chu River (or the Nam Sam River as it is called in Laos), the Bưởi River, and the Cầu Chày River. All of them join the Ma River in Thanh Hóa Province in North Central Vietnam.
The Ma River creates the Ma River Delta (also called the Thanh Hóa Delta), the third largest in Vietnam.
- Taylor, Keith Weller, "The Birth of Vietnam". University of California Press, 1983. p. 26
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