Nam Sam River

River system with the Ma Chu ( Nam Sam )

The Chu ( Vie: Sông Chu ) (Lao: Nam Sam ) is a 325 km long river in Laos and Vietnam.

It rises in the northeast of Laos near Sam Neua province Houaphan. Then it flows 165 km to the east and then crossed the border to Vietnam. Then the Chu crosses the provinces of Nghe An and Thanh Hóa and ends after another 160 km in Vietnam in the Ma. The Chu has a catchment area of ​​7580 km ², of which 4570 km ² and 3010 km ² to Laos to Vietnam omitted.