Yima City, a county-level city under the jurisdiction of Henan Province, is managed by Sanmenxia City. It borders Xin'an, Yiyang and Mianchi counties in the east, south, west and north respectively, between the east longitude of 111 ° 57 ′ - 111 ° 59 ′ and the north latitude of 34 ° 41 ′ - 34 ° 46 ′, with a total area of 112 square kilometers and seven streets under its jurisdiction. According to the data of the seventh census, as of 0:00 on November 1, 2020, Yima has 135819 permanent residents.

Yima is generally high in the north and low in the south, high in the west and low in the east, with a large north-south gradient. It is an extension of Xiaoshan Mountain in the margin of Qinling Mountains. It is located in the transition zone from the south edge of warm temperate zone to the north subtropical zone, with four distinct seasons and sufficient sunshine. There are many scenic spots and historic sites in the territory, including Hongqing Temple Grottoes, Chu Pit where 200000 Qin soldiers were killed in Xiang Yu Pit, Cixi Palace, Yangshao Culture, Longshan Culture and other ancient cultural sites that were listed in the fifth batch of key cultural relics protection units in the country.

In 2020, Yima will achieve a GDP of 13.706 billion yuan, including 184 million yuan of added value of the primary industry, 8.723 billion yuan of added value of the secondary industry and 4.799 billion yuan of added value of the tertiary industry. The tertiary industrial structure is 1.3:63.7:35.0.