What are the characteristics of the terrain of the Beijing Plain?

In ancient times, Beijing has always been called an ideal capital by Feng Shui experts as "surrounded by mountains and rivers, it must have energy". The Xishan Mountains in the west are the Taihang Mountains; the Jundu Mountains in the north are the Yanshan Mountains; and the south entrance is an important military location. The two mountain ranges meet at the south entrance of Beijing, forming a semicircular mountain bay that spreads to the southeast and surrounds the Beijing Plain.

The terrain of the Beijing Plain slopes slightly from northwest to southeast. The Sanggan River and the Yang River merged here to form the Yongding River. Therefore, the geographical layout of Beijing is "Liaojie to the east, Taihang to the west, Shuomo to the north, the military capital at its back, and the Central Plains to the south." This is particularly conducive to social and economic development and strategic control.