The Mekong separates at Phnom Penh into the main northern branch of the Mekong proper - called the Tiền River after entering Vietnam - and the southern branch of the Bassac River - which is called the Hậu River (Sông Hậu or Hậu Giang) after entering Vietnam.
- Ngo The Vinh Mekong-The Occluding River: The Tale of a River - 2010 "The first bridge of its kind, the My Thuân Bridge strides the Tiên River with a span measuring 1,535 meters. Built in 2000, it connects thetwo provinces of Vinh Long and Tiên Giang. The expected time for completion of the Cân Tho Bridge was set ..."
- Judith Ehlert Beautiful Floods: Environmental Knowledge and Agrarian Change in ... 2012 Page 19 "Coming from Cambodia and crossing the Vietnamese border at Tan Chau and Chau Doc, in the northwest of the Mekong Delta, the Mekong River splits into major branches known as the sông Tiền ('Tien River') and sông Hậu ('Hau River')."