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.
Xigu, Lanzhou area, located in the west gate of Lanzhou City, is the core industrial zone of Gansu Province and Lanzhou City, and the largest petrochemical base in western China. The region has a total area of 385 square kilometers and has jurisdiction over 40 administrative villages, 8 streets and 70 communities in 5 towns and 1 township. In 2015, the region's GDP reached 29.781 billion yuan. Xigu District has become one of the areas with the densest factors of production in the western region. It has won the titles of "National Spark Program Advanced County", "National Science and Technology Progress County", "National Science Popularization demonstration District", "National Cultural Advanced County", "National Family Planning Advanced County and District", Gansu Province double support Model City "six consecutive championships" and so on.