• Tucson
  • Guangshui City

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.

Guangshui City, affiliated to Suizhou City, Hubei Province, east-north city of Hubei Province, observer of Wuhan City Circle, former Yingshan County, Hubei Province. It is located at the southeast foot of Tongbai Mountains and at the western end of Dabie Mountains. The east is adjacent to Dawu County, Xiaogan City, the south is adjacent to Anlu City and Xiaochang County, the west is bordered by Suizhou City, and the north is bordered by Xinyang City, Henan Province. Since ancient times, it has been the focal point of north-south traffic and the "gateway to northern Hubei". It is 57.5km wide from east to west and 78.75km from north to south, with a total area of 2675 square kilometers and a population of 1.04 million in 2017. It has jurisdiction over 20 townships, towns, offices and 1 province-administered economic and technological development zone. The municipal government is stationed in Yingshan City (formerly Chengguan Town, Yingshan County). In 2014, the GDP for the whole year reached 22.804 billion yuan. Guangshui has eight famous customs in China.
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