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.
Tongxin County is located in the central and southern part of Ningxia Hui Autonomous region, under the jurisdiction of Wuzhong City. It is bordered by Yanchi County in the east and Huanxian County in Qingyang City, Gansu Province in the east, Yuanzhou District in Guyuan City in the south, Shapotou District, Zhongning County and Haiyuan County in Zhongwei City in the west, and Hongsibao District in Wuzhong City in the north. It is located on the Loess Plateau in the south of Ordos platform and is high in the south and low in the north. There are mainly five types of landforms, such as mountains, loess hills, river valleys and desert lands, with complex topography and crisscross distribution of mountains and rivers. There are Luoshan, Miboshan, Madashan, Laoye Mountain, Qinglong Mountain, Yaoshan and so on, all of which belong to Liupanshan system. In March 2019, it was listed as the first batch of revolutionary cultural relics protection and utilization district and county list.