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.
Lai'an County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province. Founded in the 26 year of Qin Shihuang (221 BC), it is called Jianyang County. After several Yi county name, to the first year of Zhongxing in the Southern Tang Dynasty (958), named Lai'an County. Lai'an County has jurisdiction over 12 townships, two provincial economic development zones, two national 4A tourist attractions and a national wetland park, with a land area of 1481 square kilometers and a total population of 490900. Lai'an County, adjacent to Nanjing Jiangbei New area, a national new area, is the core layer of Nanjing metropolitan area and an important gateway of Nanjing Jiangbei. The Chahe town under its jurisdiction is adjacent to Nanjing High-tech Development Zone and is close to Nanjing Metro Line 3 Forest Farm Station. Only 12 kilometers away from Nanjing Yangtze River Bridge. In 2017, the annual gross domestic product (GDP) of Lai'an County reached 15.94 billion yuan.