Mau Son mountain converges original factors of the natural landscape and biodiversity, from 500m to 1541m altitude. It is the homeland of wind, cloud and fog. About a hundred peaks combine consecutively to make an amazing Mau Son, look like wonderland on Earth. The climate in Mau Son is cool in summer. It is foggy, ice and snow in winter. This is an interesting destination in Lang Son. From Mau Son peak, the Northern view is an imposing scene of Vietnam- China border. Western view is Bac Son bow-shaped range of limestone. Eastern view is Na Duong-Loc Binh basin. In early XX century, The French found and explored this area. Considering as a beautiful resting place like Sapa in the Noth-West and Da Lat in central highland.