Chi Lang is one of the best known passes in Vietnamese history, a valley crossed by the Thuong river that runs nearly 20 kilometres from the Hoa river to Nhan Ly. Earth hills of the Thai Hoa Bao Dai range rise to the east and the limestone Cai Kinh range to the west, and the two ends are sealed by the Ai Quy rampart in the north and Ngo The mountain in the south, enclosing a pass about 5 kilometres long. Many battles were fought here: under the Ly dynasty Than Canh Phuc and the people of Lang Son helped defeat the Song army, and in 1285 Tran forces blocked the Yuan army at the pass. At the end of 1427 Lam Son troops lured the Ming relief army of Lieu Thang into an ambush at Ma Yen mountain, where Lieu Thang was killed and his army broke apart. South of the pass stand two rocks known in folklore as the Sword of Le To and the Stone of Lieu Thang.
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A few more places in this province to keep shaping your route.
Lang Son Citadel is a historic site with surviving walls, gates and architectural remains within the urban area.
Tam Thanh Pagoda is a worship space inside a limestone cave in Lang Son, with altars, paths and natural rock surfaces.
A market dating from the 17th century, founded by Than Cong Tai and named in a famous folk verse, holding six main sessions a month.
A mother goddess temple on a hill in Bac Le hamlet, keeping 19 wooden statues and two early twentieth century steles.
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