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.
Muli Tibetan Autonomous County, which belongs to Liangshan Yi Autonomous Prefecture of Sichuan Province, is located on the southwest edge of Sichuan Province, crossing the Yalong River in the east, Gongga Mountain in the west, Jinsha River in the south and Ganzi Prefecture in the north, covering an area of 13000 square kilometers. The average elevation of the county is 3100 meters, with a relative height difference of 4488 meters. Muli County is an autonomous county dominated by Tibetans, including 21 ethnic groups including Yi, Han, Mongolian and Naxi. It is one of the only two Tibetan autonomous counties in the country, with a total population of 130000 in 2013. Muli has an important water conservation forest in the upper reaches of the Yangtze River, which is one of the few primitive forest areas left in China. Muli has a high tourism taste because of its unique natural landscape and cultural customs, and has great potential to develop eco-tourism and leisure tourism. Muli has been known as the "Golden Kingdom" since ancient times.