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.
Sandu Shui Autonomous County, which belongs to Qiannan Buyi and Miao Autonomous Prefecture of Guizhou Province, is located in the southeast of Qiannan Buyi and Miao Autonomous Prefecture. It is the only Shui Autonomous County in China. It is located in the hinterland of "Moon Mountain and Leigong Mountain". It is bordered by Rongjiang River and Leishan in the east, Libo in the south, Dushan and Duyun in the west, and Liandanzhai in the north, 230km away from the provincial capital Guiyang, with a total area of 2400 square kilometers. In 2009, the county has a total population of 314700, of which 304700 are ethnic minorities and 202400 are aquarium, accounting for 64.8% of the total population. National Highway 321 and Guiyang-Guangzhou high-speed railway run through the county, which is one of the important channels for southwestern provinces to go to sea, and it is also a national karst forest reserve of Guilin, Guiyang and Kunming Dazhang River.