What are the characteristics of Beijing Plain?

Ancient Beijing has always been called an ideal capital by Feng Shui experts. Xishan is Taihang Mountain. Dujun Mountain in the north is the Yanshan Mountains; Nankou is a battleground for military strategists. These two mountains meet at the south entrance of Beijing, forming a semicircular mountain bay extending to the southeast and surrounding the Beijing Plain.

The terrain of Beijing Plain is slightly inclined from northwest to southeast. Sanggan River and Yanghe River meet here to form Yongding River. So geographically, Beijing is "the Liao Regiment in the east, the Taihang in the west, the Shuomo in the north, the military capital in the back and the Central Plains in the south." , especially conducive to social and economic development and strategic control.