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.
Gaolan County, which belongs to Lanzhou City, Gansu Province, is located in the central part of Gansu Province, between longitude 103 °32'- 104 °14 °E and latitude 36 °05'- 36 °51'N, with a total area of 2136 square kilometers. Gaolan County has a temperate semi-arid climate with an average annual temperature of 7.2℃. As of 2018, Gaolan County has jurisdiction over 6 towns, and the county government is stationed in Shidong Town. By the end of 2017, the total registered population of Gaolan County was 147300. In the Western Han Dynasty, it belonged to Jincheng County and first bought Jincheng County. In the third year of Qianlong in the Qing Dynasty (1738), it was renamed Gaolan County because of Gaolan Mountain. In April 1970, Gaolan County was reclassified under the jurisdiction of Lanzhou City. Gaolan County has Dongguo pear, soft pear, Bailan melon, red sand potato, black melon seeds and other specialties. Tourist attractions include Guli Garden, Shidong Temple and Ling in Shichuan Town.