Hengshan county/District, under the administration of Yulin City, Shanxi Province, is located in the transition zone from Ordos grassland to Loess Plateau. Qing Yongzheng nine years (1731) county Huaiyuan, the Republic of China three years (1914) for Huaiyuan, Anhui Province, in accordance with the territory of Hengshan Mountain peak and name. It is located in the northern part of Shanxi Province, on the southern edge of the Mu Us Desert, at the foot of the Great Wall of the Ming Dynasty, in the middle reaches of the Wuding River, and at the border of Inner Mongolia and Shanxi. It is located in east longitude 108°56 '41 "~ 110°01' 48" and north latitude 37°21 '43 "~ 38°14' 53". It is located in the center of Yulin City, adjacent to Mizhi County in the east, Zizhou County in the southeast, Zichang County of Yan 'an City in the south, Jingbian County in the west, Wushen Banner of Inner Mongolia Autonomous Region in the northwest, and Yuyang District in the north. 51 km from Yulin city. It is 517 km away from the provincial capital Xi 'an, 108 km from Mizhi County, 79 km from Jingbian, 87 km from Zizhou and 122 km from Wushen Qizhi. Hengshan District covers an area of 4,333 square kilometers, with jurisdiction over 13 towns and 5 subdistricts.

By the end of 2021, the registered population of Hengshan District was 384,530. In 2021, the total GDP of Hengshan District reached 27.347 billion yuan, an increase of 10.8%.

Hengshan District is the national energy and chemical industry base, as well as an important part of "West-east gas transmission, west-east coal transportation and west-east electricity transmission". It is also a border jam town and an old revolutionary base area with a long history. Hengshan District has been awarded "China's Top 100 Energy Counties" and "National green Model County". On September 29, 2019, the district was removed from the poverty-stricken county list. On January 9, 2019, Shanbei Storytelling was selected into the list of "Towns of Chinese Folk Culture and Art" from 2018 to 2020.

In March 2019, it was listed as the first batch of counties under the protection and utilization of revolutionary cultural relics.