Ha Giang is a mountainous province in the north-east of Vietnam that shares a 270 km land and river border with Yunnan in China.  The most northerly point of Vietnam (Lung Cu) is located in Ha Giang. Wild tea is found mainly around the Tay Con Linh mountain range, in the districts of Hoang Su Phi and Vi Xuyen, but also on parts of the Dong Van limestone Plateau. Green, white, dark and black shan tuyet teas from ancient trees are available in Ha Giang.