It is a mountainous district of Lang Son province (85 km far from Lang Son city to the southwest), with a total area of ​​about 69,786 hectares. In 2019, the population was 71,967 people, with many ethnic groups living together including Tay, Nung, Dao, Kinh, Mong and so on.

Bac Son district has 17 communes, one township, bordering Vo Nhai district (Thai Nguyen province) to the west, Huu Lung district to the south, Binh Gia district to the north, Van Quan district to the east.

Website:  https://bacson.langson.gov.vn