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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.

Jiyang District, which belongs to Sanya City, Hainan Province, is located in the east of Sanya City, between 109 °31 °E longitude 109 °48 °E and 18 °14 °N latitude 18 °37'. The total area is 372 square kilometers. Jiyang District has a tropical marine monsoon climate, with an average annual rainfall of 1417 mm and an annual average temperature of 25.4 ℃. The rate of reaching the standard of good air days in 2017 was 98.6%. As of 2018, there are 20 communities, 19 villages, 106 natural villages, 126 resident groups and 157 village groups in Jiyang District. Yingbin Road, the government station. At the end of 2017, the total population of Jiyang District was 164672. Jiyang District is the transportation hub connecting the eastern, central and northern cities and counties of Hainan. It is not only the eastern gate of Sanya, but also the city's politics, economy,
Airport In JiYang District - Tianjin Binhai International Airport
Tianjin Binhai International Airport (Tianjin Binhai International Airport, IATA: TSN, ICAO: ZBTJ), located in Dongli District, Tianjin, China, 13 kilometers away from the city center, is a 4E-level civil international airport     , is China International Aviation Logistics Center   , an airport with international scheduled flights, a national first-class air port open to the outside world, and one of China's major air cargo centers.    
Tianjin Binhai International Airport, formerly known as Tianjin Zhangguizhuang Airport, was first built in November 1939; it was officially opened to navigation in 1950; the first phase of the expansion project was completed in 2007; the second phase of the expansion project was completed in August 2014.   
According to the official website of the airport in August 2017, Tianjin Binhai International Airport has two terminal buildings, namely T1 (international and regional) and T2 (domestic), with a total construction area of ​​364,000 square meters and a warehouse area of ​​74,000 square meters; It has 2 runways with lengths of 3600 meters and 3200 meters respectively; 59 seats.   By the end of 2016, the airport had opened 180 air routes and 132 navigable cities.  
In 2019, Tianjin Airport handled 23.813 million passengers, a year-on-year increase of 0.9%; cargo and mail throughput was 226,000 tons, a year-on-year decrease of 12.6%; and transported 167,000 vehicles, a year-on-year decrease of 6.4%.  
In October 2020, it was rated as an advanced group in the national transportation system to fight against the new crown pneumonia epidemic.  
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