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.
Guizhou, referred to as "Guizhou" or "Gui" for short, is a provincial administrative region of the people's Republic of China. Guiyang, the provincial capital, is located in the hinterland of southwest China. It is a transportation hub in southwest China and an important part of the Yangtze River economic belt. China's first national big data comprehensive experimental area, world-famous mountain tourism destinations and major mountain tourism provinces, national ecological civilization experimental area, inland open economic experimental area. It is bounded by 24 °37 degrees north latitude 29 °13 'longitude, 103 °36 degrees east longitude, 109 °35 degrees east longitude, Sichuan and Chongqing to the north, Hunan to the east, Guangxi to the south, and Yunnan to the west. The topography of Guizhou is high in the west and low in the east, tilting from the middle to the north, east and south. The geomorphology of the province can be summarized as follows: the topography is high in the west and low in the east, tilted from the middle to the north, east and south, and the landform is plateau and mountainous area.