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.
Guoluo Tibetan Autonomous Prefecture is an autonomous prefecture under the jurisdiction of Qinghai Province. it is located in the southeast of Qinghai Province in China, facing Gannan Prefecture and Huangnan Prefecture to the east, Aba Autonomous Prefecture and Ganzi Prefecture to the south, Yushu Prefecture to the west and Haixi Prefecture and Hainan Prefecture to the north; all are above 4200 meters above sea level, with a continental climate of the plateau. The state has a total area of 76400 square kilometers and has jurisdiction over six counties with a total population of 205700 in 2017. There are Animaqing Peak and Nianbaoyu Peak in Guoluo Tibetan Autonomous Prefecture; Zaling Lake and Eling Lake, which are called Baihai Shenhu Lake in ancient times, and the historical story of Tibetan-Han marriage; there are famous temples, ancient temples and cultural landscapes such as Laga, Baiyu, Chalang and so on. Because of its special geographical location and natural environment, the whole territory of Autonomous Prefecture is listed in the ── "Sanjiangyuan" Nature Reserve, the largest nature reserve in the country. two hundred and one