Situated up in the mountainous north-east region of the country the medium-sized town of Lang Song is close to the Chinese border and was in fact partially destroyed by invading Chinese forces in February 1979. The area is home to Nung, Tho, Man and Dzao Montagnards who continue to live a very traditional way of life.

Just outside the town is the wonderful Tam Thanh Cave. This huge cavern has a pool of water and a Buddhist altar inside. There is also a viewing point from which there are splendid views of the surrounding rice fields. Next door are the ruins of the Mac Dynasty Citadel that date back to the 17th century. From here again there are great views from this quiet spot. Nearby is the town of Dong Dang where the Sino-Vietnam Friendship pass border is. Also worth seeing is the Buddhist Tien Pagoda and the local Dong Kinh Market.