The sixteen prefectures of Yanyun are the whole territory of present-day Beijing and Tianjin, as well as the northern regions of Hebei and the northern regions of Shanxi.

If you lose Lingbei (Wang Wei's poem is protected in Yanran's Yanran Metropolitan Protectorate), Yanyun will be harmed, and if Yanyun is lost, it will be disaster in the Central Plains.

Yanyun Sixteen Prefectures are also called

"Sixteen States of the Shadow Thistle",

The name "Yanyun" was first seen in the "History of the Song Dynasty and Geographical Chronicles". Including Yan (You), Ji, Ying, Mo, Zhuo, Tan, Shun, Yun, Confucian, Confucian, Concubine, Wu, Xin, Wei, Ying, Huan, Shuo, a total of 16 states.

You, Ji, Ying, Mo, Zhuo, Tan, Shun seven states are located in the southeast of the north branch of Taihang Mountain, the rest of the Yun, Confucian, Concubine, Wu, Xin, Wei, Ying, Huan, Shuo Kyushu in the northwest of Taihang Mountain, the importance of the sixteen states of Yanyun to the south is like the Lingbei province to the north, the terrain is condescending, easy to defend and difficult to attack, the geostrategic value is huge, the Yuan Dynasty called it the belly.

This book will focus on portraying the importance of the sixteen states of Yanyun, so that it can appear as soon as possible.

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