The Bassac River (commonly called Tonle Bassac) is a distributary of the Tonle Sap and Mekong River. The river starts from Phnom Penh, Cambodia, and flows south out to the Vietnamese border near Ch?u ??c. In Vietnam, it is known as the H?u River (S?ng H?u or H?u Giang in Vietnamese). The Bassac River is a popular entry and exit route for the locals between Cambodia and Vietnam and is used for transporting goods between the two countries.