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.
Jinzhai County, which belongs to Lu'an City, Anhui Province, is located in the border area of western Anhui and the hinterland of the Dabie Mountains. It is located in the junction of three provinces, seven counties and two districts. The west and south are adjacent to Henan and Hubei provinces, with a total area of 3814 square kilometers. Jinzhai County is the largest mountain county with the largest population and tourism resources in Anhui Province, and it is also the second largest general county in China. Jinzhai County is known as "the cradle of the Red Army and the hometown of generals" and is an old revolutionary base. Provincial highways 209 and 210 run from north to south and are close to National Highway 312. Meishan Reservoir and Xianghongdian Reservoir are navigable all the year round. In 2018, Jinzhai County has jurisdiction over 12 towns and 11 townships, and has another development zone with a registered population of 683500, with a regional gross domestic product (GDP) of 11.39372 billion yuan, of which the added value of the primary industry is 18.89.