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.
Tiemenguan is a county-level city directly under the jurisdiction of Xinjiang Uygur Autonomous region. It implements the integrated management system with the second Division of Xinjiang production and Construction Corps and is managed by Xinjiang production and Construction Corps. Located at the southern foot of the Tianshan Mountains and in the eastern part of the Tarim Basin, it is the traffic hub at the intersection of the southern foot of the Tianshan Mountains and the northern slope of the Kunlun Mountains, and a necessary place in the middle of the ancient Silk Road. Tiemenguan City is composed of "one district and two towns", covering an area of 590.27 square kilometers, about 50 kilometers away from Korla, the capital of Bazhou. The name of the city comes from "Tiemenguan", one of the 26 passes in ancient China. No. 1 Xingjiang Road, Tiemenguan City, Municipal people's Government. Tiemenguan City was established on December 29, 2012. On December 29, 2018, the sixth national unity and progress demonstration zone (unit) was named by the State Civil Affairs Commission.