Sanmenxia, a prefecture level city under the jurisdiction of Henan Province, is located in the South Golden Triangle of the Yellow River at the junction of Henan, Shanxi and Shaanxi. Its landform is dominated by mountains, hills and loess plateau, belonging to the warm temperate continental monsoon semi-arid climate; With a total area of 10496 square kilometers, it has jurisdiction over 2 districts, 2 counties and 2 county-level cities. According to the data of the seventh population census, by the end of 2021, the permanent population of Sanmenxia City is 2,038,000.

Sanmenxia is known as "Five Mountains, Four Ridges and One Branch of Sichuan". It connects Guanzhong in the west, Sanjin in the north and Central Plains in the east. Longhai Railway, Lianhuo Expressway, National Highway 310, Zhengzhou-Xi'an High speed Railway run from east to west. National Highway 209, Sanmenxia Xichang Expressway and Haoji Railway run from north to south. It is a regional transportation hub city connecting Henan, Shanxi and Shaanxi provinces, moving from north to south, moving from west to east. At the same time, Yangshao culture, Taoist culture and Guo culture all originated here.

In October 2020, it was rated as the National Model City (County) for Double Support.

In 2021, Sanmenxia's GDP will be 158.254 billion yuan, an increase of 7.5% over 2020 at comparable prices.