• Dallas
  • Qinghai

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.

Qinghai Province, referred to as "Qing", is the provincial administrative region of the people's Republic of China and the capital of Xining. Located in the inland of northwest China, Qinghai is bounded by 31 °36 degrees north latitude, 39 °19 degrees north latitude, 89 °35 degrees east longitude, 103 °04 degrees east longitude, Gansu in the north and east, Xinjiang in the northwest, Tibet in the south and southwest, and Sichuan in the southeast. The overall topography of Qinghai Province is high in the west and low in the east, high in the north and south, low in the middle, high and steep in the west, tilting to the east, showing a ladder-shaped decline, and the eastern region is a transitional zone from the Qinghai-Tibet Plateau to the Loess Plateau, with complex topography and diverse landforms. The landforms of Qinghai Province are complex and diverse. More than 4/5 of the areas are plateaus, mountainous in the east and plateaus and basins in the west, with three landforms of the Qinghai-Tibet Plateau, inland arid basins and the Loess Plateau.
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