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.
Gao County, which belongs to Yibin City, Sichuan Province, is located on the southern edge of Sichuan Basin, Gongxian County and Changning County to the east, Xuzhou District to the west, Yunlian County to the south, Cuiping District of Yibin City to the north, Nanxi District to the northeast and Yanjin County, Yunnan Province to the northeast and southwest, between longitude 104 °21 and latitude 28 °11 to 28 °47', the county is 61 km long from north to south and 32 km wide from east to west, with a total area of 1323 square kilometers. The mountains, hills and trough dams in Gaoxian County account for 43.88% respectively. 43.72%, 12.4%. There are 31 large and small rivers, belonging to the Jinsha River and the Yangtze River system, of which Nanguang River is the largest river in the county. It belongs to the humid monsoon climate in the middle subtropics, with an annual average temperature of 18.1 ℃ and a precipitation of 1021 mm.