• Tucson
  • Baoqing 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.

Baoqing County, which belongs to the escrow County of Shuangyashan City, Heilongjiang Province, is located in the east of Heilongjiang Province, the core of Sanjiang Plain and the hinterland of Beidahuang. the geomorphological features can be summarized as "four mountains, one water and four fields, half Reed and half grassland". The administrative area of Baoqing County covers an area of 10001.27 square kilometers, with a population of 470000 as of 2010. Baoqing County is a typical resource county, agricultural county and ecological county, which is known as "coal power base", "granary of the north", "county of abundance" and "hometown of wetlands". The main scenic spots in Baoqing County are Zhenbao Island Revolutionary Martyrs Mausoleum, Dragon Lake Scenic spot, Dongsheng Wetland Scenic spot, Qixing River Wetland and Yanwo Island. On October 22, 2018, Baoqing County was selected into the list of national pilot areas for the integration and development of primary, secondary and tertiary industries in rural areas in 2018. two hundred and one
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