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The mountains are green and the rocks are rugged, which makes people feel the grandeur of nature. This is the Yanshan Mountains.
Yanshan is one of the famous mountain ranges in northern China. The terrain is high in the northwest and low in the southeast. It is gentle in the north and steep in the south, with narrow valleys, broken surface, and many rain-cracked gullies. It is divided into two sections, east and west, with Chaohe as the boundary. The eastern section is mostly low mountains and hills, with an altitude of generally less than 1,000 meters, lush vegetation, shrubs, weeds, and vast forests. The western section is a medium and low mountain area, generally above 1,000 meters above sea level, with sparse vegetation, and shrubs and grasslands. There are basins such as Chengde, Huairou, Yanqing, and Xuanhua between the mountains. The Great Wall was built along the ridge, and the situation was dangerous. Xifengkou, Gubeikou, Huanghuacheng, Juyongguan, Dongfangkou, Dushikou and Zhangjiakou are important passes of the Yanshan Great Wall. Since ancient times, they have been important passages from the north of Yanshan Mountain to the North China Plain.