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Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Erlianhot City, referred to as "Erlian" for short, is the largest highway and railway port opened by the people's Republic of China to Mongolia, the frontier and window for the country and autonomous region to open to the north, and the "bridgehead" closest to the Eurasian Continental Bridge. it is a separately listed city in Inner Mongolia Autonomous region. It is one of the producing areas of dinosaur fossils. Erlianhaote, the laudatory name of "hometown of dinosaurs", is located in the north-central part of Inner Mongolia Autonomous region, west of Xilingol League, 42 °55 °north latitude 43 °53 'north and 111 °17 °east longitude 112 °25 °. Across the border with Zamenude, Mongolia, the distance between the two cities is 9 miles. The length of the border line is 68.29 inches. It is 720 miles away from Beijing, 380 miles away from Hohhot, 7623 miles away from Moscow, capital of the Russian Federation, and 714 miles away from Ulaanbaatar, the capital of Mongolia. Set the second railway
Airport In Erenhot - Erenhot Saiwusu Airport
Erlianhot Saiwusu Airport (Erlianhot Saiwusu Airport, IATA: ERL, ICAO: ZBER), located near Saiwusu Science and Technology Park, Erenhot City, Xilin Gol League, Inner Mongolia Autonomous Region, China, 27 kilometers northwest of the center of Erenhot, is a 4C-level regional airport, national A first-class air port open to the outside world     .
On June 6, 2008, Erenhot Saiwusu Airport officially started construction   ; On April 1, 2010, Erenhot Saiwusu Airport officially opened to traffic   ; On July 7, 2018, the T2 (International) Terminal of Erenhot Saiwusu Airport was officially opened   .
As of April 2020, Erenhot Saiwusu Airport has 2 terminals, of which T1 (International) Terminal has an area of ​​5,043 square meters and has 2 boarding bridges; T2 (International) Terminal has an area of ​​5,949 square meters , with 2 boarding bridges; 5 C-class seats on the station apron; the runway is 2,800 meters long and 45 meters wide; it can meet the needs of annual passenger throughput of 650,000 passengers     .
In 2021, Erenhot Saiwusu Airport will handle a total of 91,003 passengers, a year-on-year decrease of 25.0%, ranking 213th in the country; cargo and mail throughput will be 94.1 tons, a year-on-year decrease of 34.2%, ranking 184th in the country; Flights, down 28.9% year-on-year, ranking 206th in the country [twenty three]  .
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