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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.

Dongan District is under the jurisdiction of Mudanjiang City, Heilongjiang Province, which is located in the southeast of Mudanjiang City. It was built in January 1958. It is adjacent to Aimin District by Binsui Railway in the north, and Xi'an District by Taiping Road in the west. The east and south are connected to Yangming District, Muling City and Ning'an City respectively. In 2006, the region's full-caliber added value, sales income, total output, profits and taxes, and profits reached 1.02 billion yuan, 3.49 billion yuan, 2.76 billion yuan, 270 million yuan and 160 million yuan respectively, up 0.9 percent, 1.7 percent, 0.8 percent, 1.4 percent and 1.1 percent respectively over 2005. The proportion of primary, secondary and tertiary production in the region was adjusted to 6:35:59. As of 2013, the administrative area is 294.2 square kilometers, and the total urban area is 5.2 square kilometers.
Airport In Dong'an District - Mudanjiang Hailang International Airport
Mudanjiang Hailang International Airport (Mudanjiang Hailang International Airport, IATA: MDG, ICAO: ZYMD), located in the southwest suburb of Mudanjiang City, Heilongjiang Province, China, 9 kilometers away from the center of Mudanjiang, is a 4C-level military-civilian joint international feeder airport and one of the country's opening-up class air port   .
On September 2, 1985, Mudanjiang Hailang Airport was officially open to navigation; in December 1998, Mudanjiang Hailang Airport was officially opened to the public with the approval of the State Council; on August 21, 2017, Mudanjiang Hailang Airport was officially renamed as Mudanjiang Hailang International Airport   .
As of February 2020, the terminal area of ​​Mudanjiang Hailang International Airport is 8,200 square meters, with 2 boarding gates; the area of ​​the civil aviation station is 38,000 square meters, with 4 seats; one is 2,600 meters long and 45 meters wide The asphalt runway can take off and land Boeing B737-800 and below; it can meet the needs of annual passenger throughput of 500,000 passengers   .
In 2019, Mudanjiang Hailang International Airport handled a total of 1,048,088 passengers, a year-on-year increase of 12.2%, ranking 103rd in the country; cargo and mail throughput was 1,290.0 tons, a year-on-year increase of 4.3%, ranking 112th in the country; aircraft took off and landed 8,128 sorties , a year-on-year increase of 8.9%, ranking 139th in the country   .
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