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.
Burjin County, which belongs to Altay, is located in the north of Xinjiang Uygur Autonomous region, at the southwest foot of Altai Mountains, along the northern edge of Junggar Basin, bordering Kazakhstan, Russia and Mongolia in the north and northeast. It is one of the two counties bordering Russia in western China (the other is Habahe County). The national boundary is 218 kilometers long and there are many rivers in the country. it is a necessary place for import and export of the two border trade ports in northwest Xinjiang. An ideal port on the border with Russia is of great development value. it is the only nearest channel to open economic and trade exchanges between Northwest China and Russia, and the largest tributary of the Ertix River, the only Arctic water system in China. It is adjacent to Mongolia in the northeast, Altay to the east, Habahe County to the west, Jimunai County and Fuhai County to the south. At the end of 2011, the total population of Burjin County