It is a border highland district in the north of Lang Son province, 67 km from Lang Son city along National Road 4A. Located in the valley on the bank of Bac Khe River, That Khe Township is the hub of  traffic routes to China, Cao Bang, connecting with Road 1B from Binh Gia district to Thai Nguyen province, National Road 3B connecting with Bac Kan province and the road back to Lang Son city. The total population of the district in 2019 was 59,827 people.

Trang Dinh district has Binh Nghi Border Gate and Na Nua border market pair, which are convenient for exchange and trade with two neighboring districts of Longzhou and Pingxiang belonging to the Guangxi Zhuang Autonomous Region, China, there are many roads and river routes to trade with China.

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