• Tucson
  • Linyi

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.

Linyi County belongs to Dezhou City, Shandong Province, adjoins Shanghe County of Jinan City to the east, Yucheng City, Pingyuan County and Ling County to the west, Tuhe River and Qihe County to the south, Majiahe River and Leling City to the north, 50 kilometers to Dezhou to the west, 60 kilometers to Jinan to the south, 300 kilometers to Beijing and 200 kilometers to Tianjin to the north, 100 kilometers to Binzhou Wharf and 300 kilometers to Qingdao Wharf to the east. Located in the economic circle around the Bohai Sea, the Yellow River Delta and the "Jingjiu" economic development zone. In 2017, Linyi County, with a total area of 1016 square kilometers, has jurisdiction over eight towns, one township, three streets and one provincial economic development zone with a population of 545000. In 2017, Linyi County achieved a GDP of 28.43 billion yuan. In 2016, the work of removing counties and establishing cities in Linyi County was carried out in an all-round way. December 29, 2018
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