• Tucson
  • Henan

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.

Henan Province, referred to as "Yu", is the provincial administrative region of the people's Republic of China. Zhengzhou, the provincial capital, is located in central China. Henan is bounded by 31 °23 & # 39 in north latitude, 36 °22 & # 39 in north latitude, 110 °21 & # 39 in east longitude, 116 °39 & # 39 in east longitude, Anhui and Shandong in the east, Hebei and Shanxi in the north, Shaanxi in the west, Hubei in the south and Henan Province with a total area of 167000 square kilometers. The topography of Henan Province is from north to south, from the east to the west, high in the west and low in the east, composed of plains and basins, mountains, hills and water surfaces, and across the four major river systems of the Haihe River, the Yellow River, the Huaihe River and the Yangtze River. Most of Henan Province is located in the warm temperate zone, the south is across the subtropics, and belongs to the continental monsoon climate from the north subtropical zone to the warm temperate zone; Henan is located in the coastal open areas and the central and western regions.
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