Ma River

The Ma ( Vie: Sông Mã ) (Lao: Nam Ma ) is a 512 km long river in Vietnam and Laos. It rises in the northwest of Vietnam, then crossed the border to Laos, to return later to cross the border into Vietnam and to open out there in the Gulf of Tonkin in the South China Sea.

Its largest tributaries are the Chu ( Vie: Sông Chu ) (Lao: Nam Sam ), the BUOI and Cầu Chay, all of which drain into the province of Thanh Hóa in the Ma. From its 512 km run 410 km in Vietnam, and 102 km in Laos. It has a catchment area of ​​28,400 km ² and an average discharge of 52.6 m³ / s The Ma has the third largest Delta of Vietnam.

The river forms the boundary between the historic regions and former French protectorates Tonkin in the north and Annam in the south.

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