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.
Zaduo County belongs to Yushu Tibetan Autonomous Prefecture of Qinghai Province, bordering Yushu and Nangqian counties in the east and southeast, Tanggula Mountain in the west, Dingqing, Baqing, Nierong, Suoxian and Anduo in Changdu and Naqu in the Tibet Autonomous region in the south and southwest, and Zhiduo County in the north. The area is 35000 square kilometers. At the end of 2014, the total population of the county was 62769, mainly Tibetans, including Han, Turkish, Hui, Mongolian and other ethnic groups. Zaduo County has Sanjiangyuan Nature Reserve, Ansai primeval forest, Zuoqing Temple and other tourist attractions. Zaduo County Postal Code: September 25, 8153992018, won the honorary title of "2018 e-commerce into rural comprehensive demonstration county" of the Ministry of Commerce.