• Tucson
  • Huantai

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.

Huan Tai is a county under the jurisdiction of Zibo City, which is located in the combination zone of the mountain area of central Shandong Province and the northern part of Lubei Plain. it is located in the north of Shandong Province, north of Zibo City, between latitude 36 °51 °50 "- 37 °06 °00" north and longitude 117 °50 "- 118 °10 °40" east, bordering Boxing and Gaoqing counties in the north, Linzi District in the east, Zhangdian District and Zhoucun District in the south and Zouping County in the west. The county covers an area of 509 square kilometers. The terrain in Huantai County is high in the south and low in the north, tilting from southwest to northeast, slightly in the shape of microwave. It is located in the warm temperate continental monsoon climate. As of 2015, Huantai County has one national AAAA tourist area, two national AAA tourist areas and one famous Chinese historical and cultural town. As of 2015, Huantai County has jurisdiction over 2 streets and 7
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