Tangshan City, referred to as "Tang" for short, is a prefecture-level city under the jurisdiction of Hebei Province, located in the center of Bohai Bay, in the east of Hebei Province, facing Qinhuangdao City across the Luanhe River in the east, Tianjin City in the west, Bohai Sea in the south and Chengde City across the Great Wall in the north. It is between east longitude117 31'-1919', north latitude 38 55'-40 28', and is about/kloc-from east to west.

Qinhuangdao125km in the east, 40km in the south from Bohai Sea, 366km in the southwest from Tianjin108km from Shijiazhuang, the provincial capital, and 0/54km from Beijing/KLOC-0 in the northwest. Tangshan City is located at the southern foot of Yanshan Mountain, with high terrain in the north and low terrain in the south, which tends to be gentle from west, northwest to east and southeast until it reaches the coast. The north and northeast are mountainous, with an altitude of 300-600 meters.

geological structure

There are many stratigraphic sequences in Tangshan city, and Archaean and Proterozoic are mainly exposed in the northern mountainous areas. Cambrian and Ordovician are mainly distributed in the two wings of Kaiping syncline; Most of Carboniferous and Permian are concealed in the southern plain. A small amount of Jurassic is exposed in Lianhuayuan and Guantou Mountain in Qian 'an County.

Tertiary is found in Xinzhuang-Yinzhuang area south of Qianxi County and buried deep in the south of Xugezhuang-Luannan County Changning line in Fengnan District. Quaternary system is extremely developed, and its distribution area accounts for about 3/5 of the total area of the city, forming a vast piedmont inclined plain.

Geologically, the jurisdiction is located at the junction of the southern edge of the eastern section of Yanshan skirt wrinkle belt of China-Korea paraplatform and Huanghua depression in North China depression. From the viewpoint of geomechanics, it belongs to the intersection of zonal tectonic system, Neocathaysian tectonic system and the reflex arc of the east wing of Qiluheshan type structure, and its tectonic state is quite complicated.

The above contents refer to Baidu Encyclopedia-Tangshan City.