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.
Tunchang County is located in the north of the central part of Hainan Island, at the northern foot of Wuzhishan and the south bank of Nandu River. It is 85 kilometers north from the center of Haikou, the provincial capital, bordering Ding'an and Qionghai in the east, Qiongzhong in the south and Chengmai in the northwest, which is the throat of Qiongbei platform entering Wuzhishan area. The county seat is located in the center of the county and lies 86 kilometers along the Haiyu middle line. It is a transportation hub between the north and the south and across the east and west of Hainan. There are 8 towns and 6 state-owned farms in the county. Tunchang County as early as more than 100 years ago, Tunchang formed the custom of men and women, old and young practicing martial arts, which continues to this day. In 2015, Tunchang County was named "the hometown of National Wushu" by the Wushu Sports Management Center of the State General Administration of Sports.