• Tucson
  • Laishan District

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.

Laishan District, which belongs to Yantai City, Shandong Province, is located in the main urban area of Yantai City, bordering Muping District of Yantai City in the east and south, Fushan District of Yantai City in the southwest, Zhifu District of Yantai City in the northwest, and the Yellow Sea in the northeast. Between longitude 121o 1925 "- 121o 3329" east, latitude 37 °17050 "- 37 °31m 40" north, the maximum east-west distance of the area is 15.9km, and the maximum distance between north and south is 31km, with a total area of 285.43 square kilometers, of which land is 273.6 square kilometers, accounting for 95.9%; water area is 11.8square kilometers, accounting for 4.1 per cent. Laishan District temperate maritime climate characteristics are obvious, sunny, four distinct seasons, no cold in winter, no dry in summer, no hot heat in summer, superior natural environment. The beginning of air environmental quality
Airport In Laishan District - Yantai Penglai International Airport
Yantai Penglai International Airport (Yantai Penglai International Airport, IATA: YNT, ICAO: ZSYT), located in Chaoshui Town, Penglai District, Yantai City, Shandong Province, China, about 43 kilometers away from the center of Yantai, is a 4E-class civil transport airport and a national first-class aviation port   , Member of East China Airport Group   .
Yantai Penglai International Airport officially started construction on December 26, 2009. Its test flight was successful in November 2014, and it officially opened to traffic on May 28, 2015. According to the official website of the airport in February 2019, the airport has a domestic and international terminal area of ​​90,000 square meters, an apron covering an area of ​​400,000 square meters, a runway of 3,400 meters long, and 39 parking spaces, which can meet the needs of large-scale airports such as Boeing 747. The plane took off and landed safely.  
In 2019, the passenger throughput of Yantai Penglai International Airport exceeded 10 million   , an increase of 26.6% year-on-year; the cargo and mail throughput was 41,100 tons, a year-on-year decrease of 4.4%;  
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