Mian (mi ǎ n) Chi County, subordinate to Sanmenxia City, Henan Province, is located in the northwest of Henan Province, bordering on the Yellow River in the north and facing Yuanqu, Xiaxian and Pinglu in Shanxi Province across the river, connecting with Luoyang and Yiyang in the south, neighboring Yima in the east and Xin'an in the east, and Xiaohan in the west and Shanzhou District in the west. It is the famous place of origin of human ancestors and the world-famous discovery place of Yangshao culture. The geographical coordinates range from 111 ° 33 ′ to 112 ° 01 ′ E and 34 ° 36 ′ to 35 ° 05 ′ N, belonging to the temperate monsoon climate. According to the data of the seventh population census, as of 00:00 on November 1, 2020, the permanent population of Mianchi County is 310130. Mianchi County is 43.5km wide from east to west, 52.8km long from north to south, with a total area of 1368km2 and a total population of 3589000 (2017). The county has jurisdiction over 6 towns and 6 townships. The county people's government is located in Chengguan Town, 190km away from the provincial capital Zhengzhou and 300km away from the ancient capital Xi'an.

Mianchi County, located at the west end of the "Zhengluo Industrial Corridor", is an important energy, metallurgy, building materials and refractory base in Henan Province, and the second batch of counties (districts) that have reached the standard for building a water-saving society.

In 2019, the GDP of Mianchi County is expected to grow by 8% year on year, the general public budget revenue will reach 2.89 billion yuan, an increase of 12%, the added value of industries above designated size will increase by 8.7%, the investment in fixed assets will increase by 10.1%, the total retail sales of consumer goods will reach 6.98 billion yuan, an increase of 10%, and the per capita disposable income of urban residents and rural residents will reach 34083 yuan and 17605.5 yuan, respectively, an increase of 8% and 9.6%.