The Cả River (Laotian: Nam Khan, Vietnamese: Sông Cả or better known as sông Lam/Lam River) is a river in mainland Southeast Asia. It originates in the Loi Mountains of Laos, crossing Lao PDR's Xiangkhouang Province, Vietnam’s Nghệ An and Ha Tinh provinces and empties into the Gulf of Tonkin, on the North Central Coast of Vietnam, after a 612 km journey.