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.
Yunyan District, which belongs to Guiyang City, Guizhou Province, is located in the north of the north-south "boat basin" of Guiyang City. It is located in the north half of Guiyang City, bordering Wudang District and Guanshan Lake District on the east, west and north, bordering Nanming District in the south and Baiyun District in the northwest. It is 17.5 km long from east to west, 12.5 km wide from north to south, and covers an area of 93.57 square kilometers. The total population is 950000 (2012). Yunyan District is one of the central urban areas of Guiyang City, the main part of the old city of Guiyang, and the resident area of the people's Government of Guizhou Province. In 2013, Yunyan District took the lead in breaking through 50 billion yuan in GDP, 30 billion yuan in fixed assets investment and 1 percent in total financial revenue.