It is a class II city of Lang Son province, with the area of about 78.11 km². The city is located on National Road 1A, 18 km from the Vietnam-China border; 15 km from Huu Nghi International Border Gate and 13 km from Dong Dang to the northeast. It borders Thach Dan and Thuy Hung communes to the north, Tan Thanh commune, Yen Trach commune (Cao Loc district) and Van Thuy commune (Chi Lang district) to the south, Cao Loc Township and Gia Cat and Hop Thanh, Tan Lien communes to the east, Xuan Long commune (Cao Loc district) and Dong Giap commune (Van Quan district) to the west. The city consists of five wards and three communes.

The population of the city in 2019 was 103,284 people, with many different ethnic groups such as Kinh, Tay, Nung, Hoa, Dao, Muong, San Diu, San Chi and so on.

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

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