Nam Sam River
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Nam Sam River (name in Laos) or Chu River (name in Vietnam, Vietnamese: Sông Chu) is the largest tributary of Ma River. It originates from Houa peak at 2062 m near Sam Neua town, Houaphan Province in Eastern Laos and travels eastern to meander through Nghe An and Thanh Hoa Provinces of Vietnam. It joins Ma River on the left in Tho Xuan.
The river is 325 km long (165 km in Laos and 160 km in Vietnam) with a drainage area of about 7,580 km² (4,570 km² in Laos and 3,010 km² in Vietnam).