Tianjin is located in the north of North China Plain, bordering Bohai Sea in the east and Yanshan Mountains in the north, between east longitude116 43' and north latitude1/8 04' and 38 34' and 4015'. The city center is located at east longitude 1 17 10' and north latitude 39 10'.
The central city is the birthplace of Tianjin and the center of politics, culture, education, economy and commerce. According to the function of service industry, the central city is positioned according to the functions of "financial peace", "business west", "science and technology south", "gold trade east", "creative Hebei" and "business red bridge".
Binhai New Area is a sub-provincial area, a national new area and a national comprehensive reform experimental area under the jurisdiction of Tianjin. It is the gateway to the opening up of the north, a high-level modern manufacturing industry and R&D transformation base, the core area of international shipping and logistics in the north, and a livable ecological new city. It is formed by the integration of Tanggu District, Hangu District, Dagang District and Tianjin Economic and Technological Development Zone.
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The geological structure of Tianjin is complex, and most of it is covered by Cenozoic sediments. The terrain is dominated by plains and depressions, with low mountains and hills in the north, and the altitude gradually decreases from north to south. The highest in the north, with an altitude of1052m; The lowest in the southeast, 3.5 meters above sea level. The highest peak in the city: Jiushan Peak (elevation1078.5m). The general outline of the landform is high in the northwest and low in the southeast.
Tianjin has three kinds of topography: mountains, hills and plains, with plains accounting for about 93%. Except the mountainous area bordering the southern foot of Yanshan Mountain in the north, the rest are alluvial plains, and the mountainous area in the north of Jixian County is a low mountain and hill below 1000 meters above sea level. Near the mountain is an inclined plain composed of alluvial fans, which is fan-shaped The southern part of the inclined plain is alluvial plain, and the southeastern part is coastal plain.
Baidu Encyclopedia-Tianjin