The Kansas City metropolitan area is a bi-state metropolitan area anchored by Kansas City, Missouri. Its 14 counties straddle the border between the U.S. states of Missouri (9 counties) and Kansas (5 counties). With 8,472 square miles (21,940 km2) and a population of more than 2.2 million people, it is the second-largest metropolitan area centered in Missouri (after Greater St. Louis) and is the largest metropolitan area in Kansas, though Wichita is the largest metropolitan area centered in Kansas. Alongside Kansas City, Missouri, these are the suburbs with populations above 100,000: Overland Park, Kansas; Kansas City, Kansas; Olathe, Kansas; Independence, Missouri; and Lee's Summit, Missouri.
Dingbian County is located in the northwest of Shaanxi Province, the westernmost end of Yulin City, and the junction of seven counties (banners) of four provinces (regions) of Shaanxi, Gansu, Ningxia and Inner Mongolia. In ancient times, it is said that "Yuyan is connected to the east, Ganliang to the west, Huanqing to the south, pillow desert to the north, Tu Guang Bian long, and Sanqin fortress". It is the northwest gate of Shaanxi Province and the west gate of Yulin City. Since ancient times, merchants have gathered, known as "dry wharf". The county has jurisdiction over 1 subdistrict office, 14 towns and 4 townships. Mineral resources such as oil, natural gas, raw salt, mirabilite, magnesium sulfate and magnesium chloride have many advantages, which are an important part of the energy and heavy chemical industry base in northern Shaanxi. The domestic oil resources are widely distributed, with proven reserves of 1.618 billion tons, making it the largest county in oil production capacity in the country. Dingbian County is also the salt producing area of Shaanxi Province, with 14 salt lakes and a total area of 98 square kilometers. In addition, the whole county