The China–Vietnam border is the international boundary between China and Vietnam, consisting of a 1,297 km terrestrial border stretching from the tripoint with Laos in the west to the Gulf of Tonkin c
The confluence of the Red River and the Longbao River, where the China-Vietnam border leaves the Red River.
The Nanxi River, also known as the Nậm Thi River in Vietnamese or Namiti, is a tributary of the Red River located in China's Yunnan province. It is a border river of Lào Cai, Vietnam, and Hekou, China
The Yunnan–Vietnam Railway crosses the Nanxi River from Hekou, China (left) to Lao Cai, Vietnam (right) on a bridge a short distance upstream from the river's mouth