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.
Gejiu City is a municipality under the jurisdiction of Honghe Hani and Yi Autonomous Prefecture, Yunnan Province, China, which is located between 102 °54'E and 103 °25'E and 23 °01'N 23 °36'. "Gejiu" is evolved from the transliteration of "fruit work" in the Yi language, which means a place to grow buckwheat and eat buckwheat. Gejiu is 280 kilometers away from the provincial capital Kunming and 200 kilometers from Vietnam. The city has a land area of 1587 square kilometers, with a total population of 453300, of which the urban population is 309500, the level of urbanization is 68.30%, the urban built-up area is 12 square kilometers, and the urban resident population is 180000. There are more than 120000 ethnic minorities living in Yi, Zhuang, Hui, Miao, Dai and Hani. Gejiu is a kind of metallurgy which mainly produces tin and produces lead, zinc, copper and other non-ferrous metals.