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.
Yantan District belongs to Zigong City, Sichuan Province, named after the district government stationed in Yantan Town. It was founded in 1953 and is located at the south gate of Zigong City. It is the hometown of martyr Lu Deming, commander of the Autumn Harvest uprising, and is one of the four municipal districts of Zigong City, the salt capital of the millennium. 12 kilometers away from Zigong City. The north is bordered by Da'an District, covering an area of 467.99k. The outline of the area is full of triangles, the landform is mainly hilly, the terrain is high in the northwest and low in the southeast, with an average elevation of 300 li 400 meters. Belongs to the gentle slope low hill, the gentle slope middle hill landform type, does not have the shape mountain range, suitable for ploughing area is large. At the end of 2011, the area of cultivated land along the beach was 258700 mu, including 163100 mu of paddy field, 95700 mu of dry land and 0.77 mu of per capita arable land.