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.
Weng'an is located in the southwest hinterland, is a national health county and China's ecological charm county, the national phosphorus chemical ecological production base, known as the "Asian phosphorus warehouse" reputation. Weng'an is an old revolutionary base. The Red Army passed Weng'an four times on the long March and held a historic monkey farm meeting in Weng'an, which Comrade Zhou Enlai called "the eve of a great turning point." Weng'an is the place of origin of life and the ancient city with thousands of years of civilization. Fossils of faunas from 610 million years ago have been found here, and they are the earliest fossils found so far. On December 25, 2017, the General Office of Guizhou Provincial Government issued the implementation Plan for Guizhou Province to accelerate the Construction of a New Type of urbanization with Mountain characteristics, which shows that the Guizhou Provincial Government supports Weng'an County to remove counties and cities.