The middle part is flat and belongs to the plain.

The southern and western coastal saline-alkali land and lowland grass moor belong to the plain.

Tangshan landform:

1, inland: Tangshan City is located at the southern foot of Yanshan Mountain, with high terrain in the north and low terrain in the south, and tends to be gentle from west, northwest to east, southeast to the coast. North and northeast mountainous, 300-600 meters above sea level; The central part is Yanshan piedmont plain, below 50 meters above sea level, with flat terrain; There are coastal saline-alkali land and lowland grass marshes in the south and west, and the altitude is below15m to10m. The highest peak in Tangshan is Bamian Peak in Qingshan Pass, with an altitude of 842 meters. This peak is steep and steep, with prominent main peak, unique prison building and unique 72-vote building.

2. Coastal: According to the latest survey results of the coastline of Hebei Province from June 5438 to February 2008, the total length of the mainland coastline of Tangshan City is 229.7 kilometers, 33.2 kilometers longer than the original. It is reported that the mainland coastline of Tangshan City starts from Laoting in the east, along the river bank to Changli County boundary, bordering Qinhuangdao City, and west to the northern boundary of Tianjin and Hebei on the west side of Jianhekou, adjacent to Tianjin. The developed port coastline mainly includes Tangshan Jingtang Port Area and Tangshan Caofeidian Port Area, about 32.5 kilometers, accounting for 14. 1% of the total coastline of the mainland. The developed coastline is mainly used for port shipping, aquaculture and salt industry. In addition, there are many large and small islands 100 and island coastlines125.7km in the waters near Luanhekou and Caofeidian in Tangshan. The famous islands are Xiangyun Island, Yue Tuo Island, Bodhi Island and Dragon Island.

Tangshan City is located in:

Located in the center of Bohai Bay, east of Hebei Province, east longitude11'-1919', north latitude 38 55'-40 28', east of Qinhuangdao and west of Qinhuangdao. Total area 17040 km2. Among them, the total land area is 13472 square kilometers, the sea area is 4440 square kilometers, and the total length of the mainland coastline is 229.7 kilometers. The downtown area is located in the middle of Tangshan City, bordering Luanxian County in the east and north, Caofeidian area in the south and Fengrun area in the west. It is located at125km east of Qinhuangdao, 40km south of Bohai Sea,108km southwest of Tianjin and154km northwest of Beijing.

Plateau:

Plateau refers to a relatively complete large-scale uplift area with an altitude of more than 500 meters, vast territory, open terrain and obvious steep slopes around it. The plateau is called "the stage of the earth", which was formed in the long-term and sustained large-scale crustal uplift movement. Some plateaus have broad and flat surfaces with little fluctuation; Some high principles are that the mountains are undulating and the terrain changes greatly. The highest plateau in the world is the Qinghai-Tibet Plateau in China, and the largest plateau is the Antarctic ice and snow plateau. The most essential feature of the plateau is its low terrain and high altitude. Plateau is widely distributed, plus closed basins, accounting for about 45% of the earth's land area. The formation of highlands is closely related to the formation of the earth.

Ordinary:

Plain is a large area with flat ground or little fluctuation, which is mainly distributed on both sides of rivers and near the ocean.

There are two kinds of plains: independent plains, which are one of the five basic land landforms in the world, such as the plains in the lower reaches of the Yangtze River. The secondary plain is a component of a larger terrain. Plateau can include a basin (Qinghai-Tibet Plateau includes Qaidam Basin), and basins often have plains and hills of different sizes, such as Guanzhong Plain, Chengdu Plain (in Sichuan Basin) and several plains in the middle reaches of the Yangtze River. Relationship between basins and plains: Some basins include plains, hills and river valleys. For example, the plains of Songliao Basin and other basins constitute the Northeast Plain, and the two lakes basins include the two lakes Plain. Some large depressions in the central plain are also basins, such as Bohai-North China Basin in North China Plain and Siberia Basin in Siberia Plain.

Hills:

Hill, as one of the five basic land landforms in the world, refers to the topography of the earth's lithosphere, which is composed of various gently undulating rocks. The absolute height is less than 500 meters, and the relative height is less than 200 meters, with little fluctuation, gentle slope, rugged ground and continuous hills. Generally, the hills are gentle in slope, broken in cutting, without a certain direction, generally without obvious veins, and the top is round, which is the product of long-term erosion in mountainous areas.

China mainly has southeast hills. Jiangnan hills, Jianghuai hills, Zhejiang and Fujian hills, Guangdong and Guangxi hills, Liaojiao hills,? Shandong hills,? Hills in central Sichuan? Loess hills, etc. Hills are widely distributed on land, generally in mountainous areas or the transition zone between plateau and plain. The hilly area is rich in precipitation, which is suitable for the cultivation and growth of various economic trees and fruit trees and is very beneficial to the development of various economies.