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.
Xinghai County is located in the southwest of Hainan Tibetan Autonomous Prefecture of Qinghai Province, and is located in the core area of national nature conservation of "Sanjiangyuan". The county has a total area of 12100 square kilometers, facing Guinan and Tongde across the Yellow River in the east, Gonghe County in the north, Dulan County in Hercynian Mongolian and Tibetan Autonomous Prefecture in the west, and Maduo County and Maqin County in the south. It is 248 kilometers away from Xining, the capital of Hainan Tibetan Autonomous Prefecture, and 103 kilometers away from Qiabu, capital of Hainan Tibetan Autonomous Prefecture. The geographical coordinates are 34 °48 degrees north, 36 degrees 14 degrees north and 99 degrees 01 degrees east, 100 degrees 59 'east. The average elevation of Xinghai County is 3924 meters (Ziketan Town, where the county government is located, is 3303 meters above sea level). Although the highest point of the Ela Mountains is 5305 meters above sea level in Genergang, the lowest point is 2590 meters above sea level at the exit of the Yellow River in Heka Town. Full