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.
Qitaihe City, a prefecture-level city in Heilongjiang Province, is located in the eastern part of Heilongjiang Province, south of Jiamusi City, at the western end of Wanda Mountain Mountains, belonging to low mountains and hills, high in the southeast and low in the northwest, located in the middle latitude, with a cold temperate climate and continental monsoon climate; the city has a total area of 6221 square kilometers and has jurisdiction over 3 districts and 1 county; the registered population is 777100 in 2018. Qitaihe is located in the center of the urban agglomeration in the east of Heilongjiang Province. Mujia High Speed Railway, Mu Jia Railway, Heda Expressway, Yiqi Expressway and Raogai Highway run through the whole territory, connecting with provincial capital and surrounding cities and counties, and forming a regional strategic cooperation city with 14 cities (states) in the eastern part of Northeast China. Qitaihe area is one of the birthplaces of the Sushen nationality; it was once the headquarters of the Jidong Provincial Party Committee and the second Route Army of the Anti-Japanese Union. Seven sets