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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.

Wangqing County belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Its geographical location is between 129 °51 Mel 130 °56'E and 43 °06 Mel 44 °03'N. It is bordered by Hunchun City in the east, Dunhua City in the west, Tumen City and Yanji City in the south, and Ning'an, Muling and Dongning counties in Heilongjiang Province in the north. The north-south length is 108 kilometers, and the east-west horizontal distance is 152 kilometers. Wangqing County has jurisdiction over 8 towns and 1 township. Wangqing County is 40 kilometers from the Russian border and 18 kilometers from the North Korean border. Wang Qing is located in the foothills of Changbai Mountain, which belongs to the mountain area, with an average elevation of 806 meters. It belongs to the continental mid-temperate windy climate, with long winter and short summer, four distinct seasons and great vertical variation. The annual average temperature is 3.9mm, the annual average rainfall is 580mm, the frost-free period is 110141days, and the annual sunshine.
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