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.
Yumen is a county-level city under the jurisdiction of Jiuquan City, Gansu Province. It is located in the northwest of Gansu Province, west of Hexi Corridor, east of Jiayuguan City and Jinta County, west of Guazhou County, and adjacent to Subei Mongolian Autonomous County in the north and south. The geographical coordinates are between longitude 96 °15 & # 39 × 98 °30 & # 39 39, latitude 39 °40 & # 39 × 41 °00 & # 39; between 114km from east to west and 112.5 km from north to south, with a total area of 13500 square kilometers. By 2019, Yumen had jurisdiction over 2 new and old urban areas, 3 industrial parks, 10 towns and 2 ethnic townships, with a total population of 180000, including 29 ethnic minorities such as Han, Hui, Mongolian, Tibetan and Dongxiang. In 2018, Yumen achieved a GDP of 151.2.