The Tiền River (sông Tiền or Tiền Giang) is the main northern branch of the Mekong through Vietnam.
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.
In Vietnam, distributaries of the northern branch sông Tiền or Tiền Giang include the Mỹ Tho River, the Ba Lai River, the Hàm Luông River, and the Cổ Chiên River.