Dan San Hai sea mountain pass (Shanhai Pass) is one of the gates of the fortress walls of China as an important strategic point, prevent Beijing from the North. Situated to the North-East around 15 kilometers from the city of Qinhuangdao, Hebei hawangtao (Qinhuangdao) Distance from Beijing to the North-East Dan also has a say as "Dan South in the yard" (Tian Xia City again today, First Pass Under Heaven) Dan Sun Hei was built in the Ming dynasty era. Compared to the rest of the great wall of China built up prior to the Qin dynasty era, but play a role in the history of the Ming dynasty and Qing dynasty. An important step to change the situation for several of flipping Earth one.
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