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.
Weng'an is located in the southwest hinterland, is a national health county and China's ecological charm county, the national phosphorus chemical ecological production base, known as the "Asian phosphorus warehouse" reputation. Weng'an is an old revolutionary base. The Red Army passed Weng'an four times on the long March and held a historic monkey farm meeting in Weng'an, which Comrade Zhou Enlai called "the eve of a great turning point." Weng'an is the place of origin of life and the ancient city with thousands of years of civilization. Fossils of faunas from 610 million years ago have been found here, and they are the earliest fossils found so far. On December 25, 2017, the General Office of Guizhou Provincial Government issued the implementation Plan for Guizhou Province to accelerate the Construction of a New Type of urbanization with Mountain characteristics, which shows that the Guizhou Provincial Government supports Weng'an County to remove counties and cities.