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.
Guiyang, the capital of Guizhou Province, is known as "Forest City" for short, which is named after the south of Guishan. It is the political, economic, cultural, scientific, educational and transportation center of Guizhou Province and an important transportation, communication hub, industrial base and trade and tourism service center in southwest China. One of the central cities in southwest China, the national ecological leisure vacation tourism city, the national comprehensive railway hub. Belongs to the subtropical humid and mild climate, the annual average temperature is 15.3 ℃, the annual average relative humidity is 77%, the forest coverage is 46.5% in 2016, and there are 11 forest parks. Guiyang is a national big data industrial development agglomeration area.