Lang Son is a province in far northern Vietnam, bordering Guangxi province in China. Its capital is also called Lang Son, which is a strategically important town at the border with China and is 137 kilometres (85 mi) northeast of Hanoi connected by rail and road.
Lang Son has two international border crossings. The most accessed is the Friendship Gate called the Huu Nghi Quan crossing at Dong Dang connecting to Pingxiang town in China. This is the historical first land link in the north between China and Vietnam that connects Lang Sơn and Guangxi, China. The border is open daily, from 07:00 to 17:00 and involves a walk of 500 m through the no man’s territory between Vietnam and China. There is an international train service, an express route, opened in 1996 from Hanoi to Beijing (China), which operates twice a week on Tuesday and Friday that passes through Lang Son Town and Dong Dang through this gate which has three-hour stop at the border town to complete formalities of entry from one country to the other. Passengers are not allowed to board the train at any intermediate station between Hanoi and Beijing.
Lang Son has potentiality of mineral, forestry, tourism and trading. Star aniseed (hoa hoi) is a specialty. The province has many culture and historical vestiges including Rampart of Mac Dynasty, Doan Citadel Vestige, Chi Lang Defile, Ky Cung and Bac Le temples. Apart of these, Ky Lua Market, To Thi and Mau Son mountains, Tam Thanh, and Nhi Thanh grottoes also attract many visitors.
Lang Son Province has an average annual temperature of 17–22 °C and an average annual rainfall of 1,200–1,600 millimetres (47–63 in). The average temperature in the summer is 28.5 °C (83.3 °F) and 12–13 °C (54–55 °F) in the winter, It has an average humidity of 80–85% and an average of 1600 hours of sunlight a year.
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