Cu­a khau Mong Cai (Mong Cai Border Gate) is a significant international border crossing point located in Quang Ninh Province, Vietnam. It serves as a vital gateway for trade and travel between Vietnam and China. Visitors passing through this border gate often get a glimpse of the vibrant exchange of goods and cultures in this unique border town.

Cu­a khau Bac Phong Sinh or Bac Phong Sinh Border Gate is a border gate located in Bao Lam village, Quang Duc commune, Hai Ha district, Quang Ninh province, Vietnam. It is the end point of National Highway 18B, connecting across the bridge on the Ka Long river to Ly Hoa border gate in Guangxi province, China.

Quang Ninh is a province along the northeastern coast of Vietnam. It is about 153 km (95 mi) east of Hanoi, comprising four cities, two district-level towns and seven rural districts. The provincial capital is Ha Long. The province covers an area of 6178.21 square kilometres and, as of 2019, had a population of 1,320,324.