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.
Jiuquan, a prefecture-level city of Gansu Province, is located between Altun Mountain, Qilian Mountain and Mazong Mountain at the western end of Hexi Corridor in the northwest of Gansu Province, between latitude 38 °09 "42 °48" north and longitude 92 °20 "100 °20'E. it has been the traffic fortress of the Central Plains and the northeast leading to Xinjiang and the western region since ancient times. In the north, except for a small part of Mongolia, most of it is connected with Alashan League in Inner Mongolia and Xinjiang Uygur Autonomous region to the west. The southern boundary of Qinghai Haixi Mongolian Autonomous Prefecture and Haibei Tibetan Autonomous Prefecture is adjacent to Zhangye City in the east, with a total area of 192000 square kilometers, accounting for 42% of the area of Gansu Province. Jiuquan is one of the four counties in Hexi in the Han Dynasty and an important town of the Silk Road. The terrain is high in the south and low in the north, tilting from southwest to northeast, Qilian main peak from east to west, Gaolai Mountain,