Lang Son is in the far north of Vietnam about 15km from the border with China. The town was partially destroyed in 1979 when Chinese forces invaded. However, this does seem to have affected trade between the communities either side of the border. The border post itself is heavily fortified so don't expect to spend the afternoon shopping in China. Just outside Lang Son you will find two large caves, Tam Thanh and Nhi Thanh. Both of the caves are illuminated so exploration is quite easy and very worthwhile.
Early morning buses run from Long Bien station in Hanoi and take about 5 hours to reach Lang Son.
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