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.
Tongzi County is under the jurisdiction of Zunyi City, Guizhou Province. It is located in the north of Guizhou Province, bordering Chongqing in the north, Huichuan District and Renhuai City in the south, Xishui County and Qijiang District in Chongqing in the west, and Nanchuan District and Wansheng District in the north. The ground spans 27 °57 °N 28 °54 °N, 106 °26 °E and 107 °17 °E, with a total land area of 3202 square kilometers. Tongzi County has jurisdiction over 2 streets, 20 towns, 2 townships and 1 ethnic township. At the end of 2017, the registered population of Tongzi County was 742300. Tongzi County is "the hometown of bamboo shoots in China", known as "the gateway to northern Guizhou" and "the key to Sichuan and Guizhou". Sichuan-Guizhou Railway, National Highway 210 and Yu-Zhan Expressway run through the county, and the driving time from the county seat to Guiyang and Chongqing is about 2 hours. In September 2018, Tongzi County withdrew from the poverty-stricken county.