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Indianapolis (/ˌɪndiəˈnæpəlɪs/), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Marion County was 977,203 in 2020. The "balance" population, which excludes semi-autonomous municipalities in Marion County, was 887,642. It is the 15th most populous city in the U.S., the third-most populous city in the Midwest, after Chicago and Columbus, Ohio, and the fourth-most populous state capital after Phoenix, Arizona, Austin, Texas, and Columbus. The Indianapolis metropolitan area is the 33rd most populous metropolitan statistical area in the U.S., with 2,111,040 residents. Its combined statistical area ranks 28th, with a population of 2,431,361. Indianapolis covers 368 square miles (950 km2), making it the 18th largest city by land area in the U.S.

Indigenous peoples inhabited the area dating to as early as 10,000 BC. In 1818, the Lenape relinquished their tribal lands in the Treaty of St. Mary's. In 1821, Indianapolis was founded as a planned city for the new seat of Indiana's state government. The city was platted by Alexander Ralston and Elias Pym Fordham on a 1-square-mile (2.6 km2) grid next to the White River. Completion of the National and Michigan roads and arrival of rail later solidified the city's position as a manufacturing and transportation hub. Two of the city's nicknames reflect its historical ties to transportation—the "Crossroads of America" and "Railroad City". Since the 1970 city-county consolidation, known as Unigov, local government administration operates under the direction of an elected 25-member city-county council headed by the mayor.

Indianapolis anchors the 29th largest economic region in the U.S., based primarily on the industries of trade, transportation, and utilities; professional and business services; education and health services; government; leisure and hospitality; and manufacturing. The city has notable niche markets in amateur sports and auto racing. The city is home to three Fortune 500 companies, two major league sports clubs (Colts and Pacers), five university campuses, and several museums, including the world's largest children's museum. However, the city is perhaps best known for annually hosting the world's largest single-day sporting event, the Indianapolis 500. Among the city's historic sites and districts, Indianapolis is home to the largest collection of monuments dedicated to veterans and war casualties in the U.S. outside of Washington, D.C.

Datian County (ancient Datian County, Yanping Prefecture), also known as "Yancheng", belongs to Sanming City, Fujian Province, located in the middle of Fujian Province, on the west side of Daiyunshan vein. The establishment of the county began in the 14th year of Jiajing in the Ming Dynasty (1535) and has a history of more than 480 years. The county covers an area of 2294 square kilometers and has jurisdiction over 6 townships, 12 towns, 266 administrative villages and 8 neighborhood committees, with a total population of 420000. The natural entity is "nine mountains, half water and half divided fields". There are 175 peaks above sea level, with a forest coverage rate of 70.1%. It is the birthplace of the three major tributaries of Minjiang, Jiulong and Jinjiang, and is one of the 12 key ecological functional areas in Fujian Province. Datian County is a mid-subtropical monsoon climate, evergreen all seasons, moderate temperature and humidity. The annual average temperature is 15.3 ℃ 19.6 min.
Airport In DaTian county - Sanming Sha County Airport
Sanming Shaxian Airport (Sanming Shaxian Airport, IATA: SQJ, ICAO: ZSSM), located in the North District of Jinguyuan, Shaxian District, Sanming City, Fujian Province, China, about 32 kilometers away from the center of Sanming, is a 4C-level civil transport airport   .
Sanming Shaxian Airport was officially completed and opened to navigation on March 7, 2016; it was named Sanming Shaxian Airport   .
According to information on the airport's official website in June 2019, Sanming Shaxian Airport has a terminal building of T1 (domestic in China) with a total area of ​​11,700 square meters; there is a runway with a length of 2,600 meters and 5 parking spaces   . As of October 2020, 9 domestic cities in China have been opened.  
In 2020, due to the impact of the global epidemic, the passenger throughput of Sanming Shaxian Airport was 249,700, a year-on-year decrease of 2.3%; the cargo and mail throughput was 1,000 tons, a year-on-year increase of 259.2%; the number of takeoffs and landings was 3,000, a year-on-year increase of 5.1% %; respectively ranked 177th, 159th and 190th in China   .
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