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.
Huayin, which belongs to Weinan City, Shaanxi Province, is famous for its Xiyue Huashan, located in the east of Guanzhong Plain, the combination zone of Qin, Jin and Henan provinces, Tongguan in the east, Huazhou District in the west, Qinling Mountains in the south and Weishui River in the north, between latitude 34 °19 °22 "- 34 °40 °00" and longitude 109 °54 "- 110 °12 °13" east, with a total area of 817 square kilometers. Huayin set up cities in the Spring and Autumn period and bought counties in the warring States period. It has a history of more than 2300 years. Since ancient times, it has been known as "the main roads of the three Qin dynasties and the thoroughfares of eight provinces". It is a necessary place for the Central Plains to go to the northwest. Approved by the State Council in December 1990, it is one of the four county-level cities in Shaanxi. In 1993, it was named as a famous historical and cultural city by the Shaanxi provincial government. Huayin City is the birthplace of Yang's family in the world.