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.
Pu'an County, which belongs to the Buyi and Miao Autonomous Prefecture in southwestern Guizhou Province, is located in the southwest of Guizhou Province, adjacent to Qinglong County to the east, Xingren County and Xingyi City to the south, Panzhou City in Liupanshui City to the west, and Liuzhi Special Zone in Liupanshui City to the north. In 2015, the county has a total area of 1454 square kilometers, with jurisdiction over 2 streets, 8 towns and 2 townships, and Panshui Street where the county seat is located; it has an area of 254000 mu of arable land and a total population of 331900, inhabited by more than ten ethnic groups such as Han, Miao and Buyi. In 2014, Pu'an County completed a GDP of 5.015 billion yuan. There are 46 rivers in Pu'an County, the theoretical reserve of water energy is 270000 kilowatts, and there are 28 kinds of mineral deposits such as coal, gold, iron, silicon, lead and zinc. Puan County has the oldest in the world.