Chi Lăng is a rural district of Lạng Sơn province in the Northeastern region of Vietnam. It is famous for many decisive battles at Chi Lăng pass in which the Vietnamese defeated the Chinese invaders. As of 2003, the district had a population of 77,910. The district covers an area of 703 km2. The district capital lies at Đồng Mỏ. Chi Lăng pass was the site of many battles between feudal Vietnam and northern armies.