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.
Baoting Li and Miao Autonomous County is located at the southern foot of Wuzhishan in the middle of Hainan Island. Located in the southern inland of Hainan Province, latitude 18 °23 °18 °53 north, longitude 109 °21 °109 °48 east, Lingshui County to the east, Sanya City to the south, Sanya City and Ledong County to the west, Wuzhishan City and Qiongzhong County to the north. The county is 49 kilometers wide from east to west and 54 kilometers from north to south, with a total area of 1166.6 square kilometers, accounting for 3.42 percent of the total land area of Hainan Province. In March 2017, he was shortlisted for the "2017 Top 100 Deep breathing cities". On September 25, 2018, he won the honorary title of "2018 e-commerce into rural comprehensive demonstration county" of the Ministry of Commerce. In September 2019, it was selected into the first batch of national global tourism demonstration zones.