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.
Yeji District belongs to Lu'an City, Anhui Province, with a central location of 115 °93m 15 "east longitude and 31 °86m 92" north latitude. It is located at the junction of Henan and Anhui provinces, connected by the Dabie Mountains and Jinzhai County in the south, adjacent to Jianghuai Plain and Huoqiu County in the north, Lu'an City and Hefei City in the east, and Xinyang City in Henan Province in the west. It is known as "the gate of the Dabie Mountains" and "the west gate of Anhui". Ye Ji District of Lu'an City was established with the approval of the State Council on October 13, 2015. it was officially established on February 28, 2016. it has jurisdiction over 6 township streets, including Yaoli Town, Hongji Town, Sanyuan Town, Sun Gang Township, Pinggang Street and Shihe Street, with an area of 568 square kilometers and a total population of 270000. In 2016, the region's gross domestic product (GDP) reached 5.416 billion yuan, calculated at comparable prices.