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.
Dazhou, a prefecture-level city of Sichuan Province, is located in the east of Sichuan Province. it has a history of more than 1900 years since the establishment of the county in the Eastern Han Dynasty. With an area of 16591 square kilometers, Dazhou has jurisdiction over 2 municipal districts, 4 counties and 1 county-level city, plus a high-tech zone with a total population of 6.9 million (as of December 2018, the population of the central district of Dazhou was 1.025 million). Dazhou is a populous city, an agricultural city, a resource-rich city, an industrial town, a transportation hub and an old revolutionary base in Sichuan Province. Luojiaba site and Chengba site in Dazhou are the birthplace of the ancient Ba people and Ba Culture Center in the upper reaches of the Yangtze River. It is the center of Baqu culture in Sichuan, one of the three major gas fields in the country and the starting point of the national "Sichuan gas transmission from east". It is a comprehensive national natural gas.