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San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.

Aihui District is the only municipal district in Heihe City. The old name "Jianyu", located in the northeast of Heilongjiang Province, at the northern foot of Xiaoxinganling, is the seat of Heihe Municipal Party Committee and Municipal Government, and the political, economic, cultural, educational and medical center of Heihe City. Aihui District covers an area of 14446 square kilometers and has jurisdiction over 4 streets, 3 towns and 8 townships. There are 16 state-owned agriculture, forestry and pastures with a total population of 197000. There are 26 ethnic groups, including Han, Manchu, Daur, Oroqen and so on. It is an important gateway for China to open to Northeast Asia. the country's first open cities along the border, national ecological demonstration areas and restricted development zones in the Xing'an Mountains; one of the birthplaces of the first ancestors of the Qing Dynasty The first Heilongjiang general Yamen resident; the Daur nationality moved south across the river; the northern starting point of the geographical dividing line of population between Tengchong and Tengchong.
Airport In Aihui District - Heihe Aihui Airport
Heihe Aihui Airport (Heihe Aihui Airport, IATA: HEK, ICAO: ZYHE), located in the camp of the third team of New Life, Airport Road, Aihui District, Heihe City, Heilongjiang Province, China, 15 kilometers away from Heihe city center in the northeast, is a 4C-level China Domestic Regional Airport   .
In 1933, Heihe Airport began to implement military and civilian use; on September 30, 2001, Heihe Airport resumed operations   ; In 2003, the new terminal of Heihe Airport was opened   ; In March 2016, Heihe Airport officially changed its name to Heihe Aihui Airport   .
As of August 2020, the terminal building of Heihe Aigun Airport covers an area of ​​5,800 square meters, with 1 boarding gate; 4 C-class aircraft seats on the civil aviation platform; the runway is 2,500 meters long and 45 meters wide; it can meet the annual passenger Throughput of 113,200 person-time usage requirements       .
In 2019, Heihe Aihui Airport handled a total of 215,947 passengers, a year-on-year increase of 19.4%, ranking 187th in the country; cargo and mail throughput was 35.8 tons, a year-on-year decrease of 26.8%, ranking 201st in the country; aircraft took off and landed 2,730 sorties , down 11.4% year-on-year, ranking 197th in the country   .
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