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.
Daan District, which belongs to Zigong City, Sichuan Province, is located in the south of Sichuan Basin and northeast of Zigong City, between latitude 29 °19030 "- 29 °28053" north and longitude 104408 "- 1050414" east, covering an area of 398.81 square kilometers. Daan District belongs to the subtropical humid monsoon climate type, which is characterized by abundant rainfall, rich heat, long frost-free period and four distinct seasons. As of 2018, Daan District has jurisdiction over 11 towns, 1 township and 4 streets, and the district government is stationed in Longjing Street. By the end of 2017, the total number of households in Da'an District was 160500, with a total registered population of 440000. Daan District originally belongs to Fushun County, the Republic of China 28 years (1939) under the jurisdiction of Zigong City. In 33 (1944), by