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.
Yixian, which belongs to Baoding City, Hebei Province, is located in the middle of Hebei Province. It has jurisdiction over 9 towns, 17 townships and 1 nationality township. Geographical coordinates 114o 51 & #39;-115 °37 & #39;, 39 °02 & #39;-39 °35 & #39;. The total area of Yixian County is 2534 square kilometers. In 2018, the total population of Yixian County is 581000, including 22 ethnic groups such as Han, Manchu, Hui and Mongolia. On September 29, 2018, the Hebei provincial government formally approved Yixian to withdraw from the poverty-stricken county sequence. In September 2019, it was selected into the first batch of national global tourism demonstration zones. In November 2019, he was selected into the list of the second batch of counties (districts) for the construction of a water-saving society.