• Tucson
  • Nan'ao County

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.

Nanao County, which belongs to Shantou City, Guangdong Province, is located on the sea surface at the junction of Fujian, Guangdong and Taiwan provinces, between longitude 116o 53km east and latitude 23 °11pm. Nanao County is composed of Nanao Island and 33 surrounding islands, of which the main island is 110.89 square kilometers and the sea area is 4600 square kilometers with a total area of 113.8 square kilometers. Nanao County is the closest point in Guangdong province to Taiwan Province, 162 nautical miles from Kaohsiung, at the center of the three major ports of Kaohsiung, Xiamen and Hong Kong, and only 7 nautical miles away from the main international route in the Pacific Ocean. It is known as "Chaoshan barrier, Fujian and Guangdong throat". Nanao County is the only island county in Guangdong, and it is also the only national 4A tourist area among China's island counties (districts). It has a superior geographical location. Nanao has been along the southeast since ancient times.
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