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.
Tangyin County, which belongs to Anyang City, Henan Province, is a thousand-year-old county named by the United Nations. Tangyin County is the famous "township of three saints" with convenient transportation. Within a radius of 250 kilometers, there are four provincial capitals of Zhengzhou, Shijiazhuang, Jinan and Taiyuan, which are the commodity distribution centers of Henan, Hebei, Shandong and Jin provinces. Beijing-Guangzhou Railway Jinzhong-South Railway connects north, south, west and east, and the Beijing-Zhuhai Expressway and National Highway 107 crisscross in the territory. Tangyin County is located in the Piedmont zone where the North China Plain meets the Taihang Mountains, bordering Anyang County and Anyang Wenfeng District and Longan District in the north and east to the east.