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.
Yuyang District is located in the north of Shaanxi Province and in the middle of Yulin City, adjacent to Wushen Banner in Inner Mongolia Autonomous region and Hengshan, Mizhi, Jiaxian and Shenmu in Yulin, with a total area of 7053 square kilometers, ranking second in the province. Bounded by the Ming Great Wall, the territory is bounded by the sandy grass beach area along the north, accounting for about 75% of the total area, and the hilly and gully region along the south, accounting for about 25%. Yuyang District has jurisdiction over 21 townships, 10 subdistrict (town) offices, 488 administrative villages and 50 community neighborhood committees, with a registered population of 595200 (2017), including an agricultural population of 357000 (2013) and a resident population of 662000 (2017). Yuyang has a long history and outstanding people, and human beings thrive as early as the Neolithic Age. In the Spring and Autumn period, it has been 20 years since Wei bought the county.