The natural environment of Linyi

Linyi city is located at 34 22' ~ 3613' north latitude and1/7 24' ~1911'east longitude, with the longest distance from north to south of 228km.

Linyi city has complex geological structure and relatively complete stratigraphic development, from Archean to Cenozoic,

Strata basically developed in each period. Linyi is located in the southeast of the hilly area in central and southern Shandong and in the south of the hilly area in eastern Shandong. The terrain is high in the northwest and low in the southeast, and the Yishu River runs from north to south. With yi river as the center, it is surrounded by mountains in the west, north and east, forming a fan-shaped alluvial plain to the south. The area ratio of mountains, hills and plains is 1:2:2. The mountainous areas are concentrated in the north of Linyi. The hills are mainly distributed in the periphery of mountainous areas, and the plains include the Yishu River alluvial plain, mainly distributed in the south of Yishui, the east of Yinan, Hedong, country-specific ones, Luo Zhuang, Lanling and Tancheng. Linyi belongs to the continental climate of temperate monsoon region, with suitable temperature, four distinct seasons, abundant sunshine and rainfall, the same season of rain and heat, and a long frost-free period.

The annual average temperature is 14. 1℃, the extreme maximum temperature is 39℃, the minimum temperature is -24. 1℃, the annual precipitation is 849 mm, and the frost-free period is more than 200 days. In 1950s, the lowest temperature in winter reached -24℃. Linyi City has four major water systems, namely yi river, Shuhe, Canal and Binhai, which belong to Huaihe River Basin. The main rivers in Linyi City are Yihe River and Shuhe River, with tributaries of 1035, and more than 300 rivers over 10 km.

The Yi River is 570 kilometers long, with a domestic flow of 287.5 kilometers and a maximum flow of 1.540 cubic meters per second (1.957). The larger tributaries are,,, Beng, Su and Baima River, with a drainage area of 10790 square kilometers.

Shuhe River originates from the southern foot of Yishan, with a length of 197 km and a maximum flow of 7290 cubic meters per second (1974). The larger tributaries are Xunhe River, Gaoyu River, Tanghe River, Fenyi Jin Shu Waterway, Xiazhuang River and Zhufan River, with a drainage area of 5,320 square kilometers.

The rivers in the canal system include Wuhe, Wuhe Spillway, Donghe, Xihe and Yanzi River, all of which flow into the Central Canal through Lanling County and Jiangsu Province in the south.

The rivers along the river system include the Rust Needle River, the Xiangdi River and the Qingkou River, all of which flow into the Yellow Sea.