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  • Junlian County

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.

Yunlian County, which belongs to Yibin City, Sichuan Province, is located in the southern margin of Sichuan Basin, the junction of Sichuan and Yunnan at the northern foot of the Yunnan-Guizhou Plateau, bordering Yunnan Yanjin, Yiliang and Weixin, and adjacent to Gao County and Gong County. Yunlian County is located in latitude 27 °50 °37 counties amptwitter, 28 °14 °14 °28 counties ampquotten, east longitude 104 °17 °17 counties amptwitter 104 °47 °20 counties amphibiquot; in between, the total area of the county is 1256 square kilometers. As a whole, the topography of Yunlian County is high in the south and low in the north, which is the transitional zone from Sichuan Basin to Yunnan-Guizhou Plateau. The main peak of the Great Snow Mountain in the southeast is 1777.2 meters above sea level; the Mutan River Valley in Tengda Town in the northeast is 368.5 meters above sea level, with a range of 1408.7 meters. The water system in the territory is vertical and horizontal, and there are rivers and streams all the year round.
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