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Dallas (/ˈdæləs/) is the third largest city in Texas and the largest city in the Dallas–Fort Worth metroplex, the fourth-largest metropolitan area in the United States at 7.5 million people. It is the largest city in and seat of Dallas County with portions extending into Collin, Denton, Kaufman and Rockwall counties. With a 2020 census population of 1,304,379, it is the ninth most-populous city in the U.S. and the third-largest in Texas after Houston and San Antonio. Located in the North Texas region, the city of Dallas is the main core of the largest metropolitan area in the southern United States and the largest inland metropolitan area in the U.S. that lacks any navigable link to the sea.[a]

The cities of Dallas and nearby Fort Worth were initially developed due to the construction of major railroad lines through the area allowing access to cotton, cattle and later oil in North and East Texas. The construction of the Interstate Highway System reinforced Dallas's prominence as a transportation hub, with four major interstate highways converging in the city and a fifth interstate loop around it. Dallas then developed as a strong industrial and financial center and a major inland port, due to the convergence of major railroad lines, interstate highways and the construction of Dallas/Fort Worth International Airport, one of the largest and busiest airports in the world. In addition, Dallas has DART (Dallas Area Rapid Transit) with different colored train lines that transport throughout the Metroplex.

Dominant sectors of its diverse economy include defense, financial services, information technology, telecommunications, and transportation. The Dallas–Fort Worth metroplex hosts 23 Fortune 500 companies, the second most in Texas and fourth most in the United States, and 11 of those companies are located within Dallas city limits. Over 41 colleges and universities are located within its metropolitan area, which is the most of any metropolitan area in Texas. The city has a population from a myriad of ethnic and religious backgrounds and one of the largest LGBT communities in the U.S. WalletHub named Dallas the fifth most diverse city in the United States in 2018.

Nianzishan District, Qiqihar City, Heilongjiang Province is a municipal district, located in the eastern foot of Daxing'an Mountains, located in the westernmost part of Qiqihar, about 90 kilometers away from the central city, 113 kilometers away from the railway. It is adjacent to Longjiang County in the east, south and west, Gannan County in the northeast and Zhalantun City in Inner Mongolia in the northwest. The geographical coordinates are 47 °29 "N" 47 °41 "N, 122 °53" E and 123 °05'E. The area is long from north to south, narrow from east to west, and the center is slightly prominent, which is an irregular diamond shape. As of 2013, the total area is 357 square kilometers, the cultivated land area is 170000 mu, and the urban area is 9 square kilometers. As of 2013, the total population is 81000, of which the urban population is 56000, under the jurisdiction of 4 subdistrict offices and 9 administrative villages. two
Airport In Nianzishan District - Qiqihar Sanjiazi Airport
Qiqihar Sanjiazi Airport (Qiqihar Sanjiazi Airport, IATA: NDG, ICAO: ZYQQ), located on Damintun Airport Road, Longsha District, Qiqihar City, Heilongjiang Province, China, 10.5 kilometers north of Qiqihar City Center, is a 4C-level military-civilian joint feeder airport, Temporary air ports open to the outside world   .
On May 16, 1988, Qiqihar Sanjiazi Airport officially opened for civil aviation business   ; In June 1993, Qiqihar Sanjiazi Airport became a temporary port airport   ; In 2012, Qiqihar Sanjiazi Airport terminal corridor bridge opened   ; On June 26, 2022, the west runway of Qiqihar Sanjiazi Airport will be opened [twenty three]  .
According to comprehensive news in May 2020, the terminal area of ​​Qiqihar Sanjiazi Airport is 8,000 square meters, including 4,000 square meters for the International Joint Inspection Office.   , two of which are close to the plane; the east runway is 2,600 meters long and 45 meters wide, and the west runway (military) is 3,000 meters long and 50 meters wide; it can meet the annual passenger throughput of 600,000 passengers.     .
In 2021, Qiqihar's three sub-airports will handle a total of 390,683 passengers, a year-on-year increase of 5.4%, ranking 147th in the country; cargo and mail throughput will be 701.8 tons, a year-on-year increase of 85.2%, ranking 135th in the country; aircraft take-offs and landings will be 3,692, A year-on-year decrease of 5.2%, ranking 181st in the country   .
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