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.
Menyuan Hui Autonomous County is located in the northeast of Qinghai Province, under the jurisdiction of Haibei Tibetan Autonomous Prefecture, in the east of Haibei Tibetan Autonomous Prefecture and adjacent to Gansu Province in the east and north. It is 150 kilometers away from the provincial capital Xining and 250 kilometers away from Haiyan County, the capital of Haibei Prefecture. The total area is 6896 square kilometers. Menyuan County was established in 1929, Menyuan Hui Autonomous region was established in 1953, and changed to Menyuan Hui Autonomous County in 1955. In 2013, the GDP of Menyuan Hui Autonomous County reached 292 million yuan. Hui is the main ethnic group, accounting for about 40% of the total population, as well as Han, Tibetan, Turkish, Mongolian, Salar and other ethnic groups. The total population is 155800 (2013). The original name of Menyuan County was "Xianyuan" (Xi, m é n). Because the writing of the word "Qing" was too complicated, it was unified and simplified.