Dalhan Maomingan Union Banner, Baotou City, Inner Mongolia Autonomous Region, referred to as "Damao Banner", located in China's northern border, is the Inner Mongolia Autonomous Region, 19 border banners (cities) and one of the 23 pastoral banners, north and Mongolia's East Gobi Province, bordering the North, is located in the northwest of the Great Green Mountains in the Inner Mongolia Plateau, the terrain of the south high and low in the north, tilted gently northward, the administrative region covers an area of 18,117 square kilometers, and is the largest in the world. The administrative area is 18,117 square kilometers. As of January 2023, the flag has jurisdiction over seven towns, two townships, and three soums. As of May 2022, the total population of the flag was 114,312 people. In January 1996, Dalhan Maomingan Union Banner from the former Ulanqab League transferred to the jurisdiction of Baotou City, becoming its only border flag county, there are 88.6 kilometers long border line and open to the north of Mandurah - Hangji port, there are 16,600 square kilometers of natural pasture and 662,000 acres of arable land, agricultural and livestock products, mainly fresh milk, potatoes, beef and mutton, fur and woolen fleece, etc.; the underground contains a large number of iron, rare earths, coal, oil and other resources. coal, petroleum and other resources, with 33 kinds of metal and non-metal mineral deposits proved; there are Ulanchab petroglyphs and the ruins of Oolun Sumu City that testify to the culture of the Mongolian Yuan Dynasty.In March 2019, it was announced as the first batch of counties (districts) that reach the standard of water-saving society construction.In July 2020, it was recognized as a national sanitary county city. In 2021, the gross regional product of Darhan Maoming'an Union Banner was 10.767 billion yuan, an increase of 5.4% year-on-year.