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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.

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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