• Tucson
  • Qinggang

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.

Qinggang County belongs to Suihua City, Heilongjiang Province, located in the central and southern part of Heilongjiang Province, the hinterland of Songnen Plain. It is 120 kilometers away from the provincial capital Harbin in the south, 90 kilometers from the oil city Daqing in the west, across the Tongken River from Hailun City and Wangkui County in the east, 88 kilometers away from Suihua City and Heihe City in the north. Qinggang County covers an area of 2685 square kilometers, with a total of 2.56 million mu of cultivated land, 616500 mu of grassland and 620000 mu of woodland. Qinggang County belongs to the mid-temperate continental monsoon climate. Dry and windy in spring, warm and rainy in summer, cool and dry in autumn, cold and little snow in winter, four distinct seasons, frost-free period of about 130 days throughout the year. In 2018, the GDP of Qinggang County reached 7.45 billion yuan, an increase of 5% over the same period last year.
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