Topographic features of four geographical regions in China.

The north is dominated by plains, the plains are the Northeast Plain and the North China Plain Mountains are Daxinganling, Xiaoxing 'anling, Changbai Mountain and Taihang Mountain Plateau. The southern part of the Loess Plateau is dominated by hills: the southeast hilly plain: the middle and lower reaches of the Yangtze River are mountainous, the Qinghai-Tibet Plateau is dominated by plateaus and basins, and the Inner Mongolia Plateau, Junggar Basin and Tarim Basin in the northwest of the Qinghai-Tibet Plateau.

upstate

Generally located in Daxing 'anling, east of Wushaoling, north of Qinhuai River, east of Bohai Sea and Yellow Sea.

Including all or most of the three northeastern provinces and the middle and lower reaches of the Yellow River, as well as southeastern Gansu and northern Jiangsu and Anhui.

It is the northern part of China monsoon climate zone, north of the 0℃ isotherm of 65438+1October and the 800 mm isoprecipitation line.

Southern region

It is located in the south of Qinling-Huaihe River, east of Qinghai-Tibet Plateau and southeast of East China Sea and South China Sea.

Including the middle and lower reaches of the Yangtze River, southern coastal areas and southwestern provinces (cities, autonomous regions)

It is in the south of China monsoon climate zone, south of1October 1℃ isotherm and 800 mm isohyet.

northwest area

It is generally located in the west of Daxing 'anling, north of the Great Wall and Kunlun Mountain-Altun Mountain.

Including Inner Mongolia, Xinjiang, Ningxia and northwest Gansu.

Non-monsoon climate zone, inland hinterland, west of 400 mm isohyet.

Tibetan-inhabited area

It is located in the west of Hengduan Mountain, north of Himalayan Mountain and south of Kunlun Mountain and Altun Mountain.

Including Tibet, Qinghai and western Sichuan.

Is a unique geographical unit. High altitude and cold climate.