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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.

Doumen District is under the jurisdiction of Zhuhai City, Guangdong Province. it is located at the southwest end of the Pearl River Delta, west of Zhuhai, connecting Zhongshan City to the east and Jiangmen City to the north, and connecting with the waters of Macao, between longitude 113 °0.5 'east and latitude 21 °59' and latitude 22 °25 'north, that is, between Modaomen and Yamen, the boundary between Chibi Island and Baijiao Qiwei is the widest 33.4 km from east to west. Doumen in July 1965 by Zhongshan, Xinhui designated some towns and villages to build a county, July 1983 under the jurisdiction of Zhuhai, in April 2001 to withdraw the county to establish a district. Doumen District ranked 22nd among the top 100 regions in China in 2018.
Airport In Doumen District - Zhuhai Jinwan Airport
Zhuhai Jinwan Airport (IATA: ZUH, ICAO: ZGSD), located at the southwest end of Sanzao Town, Jinwan District, Zhuhai City, Guangdong Province, China, is one of the five airports in the Pearl River Delta region.  
Zhuhai Jinwan Airport was officially completed in June 1995 and named "Zhuhai Sanzao Airport"; it was officially renamed "Zhuhai Jinwan Airport" on January 10, 2013.
According to the official website of Zhuhai Jinwan Airport in July 2018, Zhuhai Jinwan Airport has a 4,000-meter runway and a taxiway, which can meet the take-off and landing of large passenger and cargo aircraft such as B747-400; There are 17 (corridor bridge positions) and 6 remote aircraft positions; the area of ​​the terminal building is 91,600 square meters.  
In 2020, the passenger throughput of Zhuhai Airport reached 7.336 million passengers, a year-on-year decrease of 40.3%, ranking 38th in the country; the cargo and mail throughput was 38,000 tons, a year-on-year decrease of 24.8%, ranking 45th in the country; transport movements were 66,000, A year-on-year decrease of 25.3%, ranking 45th in the country. [twenty four] 
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