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.
Daguan County, which belongs to Zhaotong City, Yunnan Province, is located in the heart of Zhaotong area in the northeast of Yunnan Province. It is located between 103 degrees 43'- 104 degrees 07'E and 27 degrees 36'- 28 degrees 15'N. Daguan County, located in the hinterland of Zhaotong, has always been the main traffic road in Yunnan and Sichuan. It was the uprising site of Li (Yonghe) and Lan (Chaoding) peasant movement. The territory has overlapping mountains and "five rivers", which are rich in hydraulic, mineral resources and native products. Fresh bamboo shoots and Cuihua tea are local specialties, rich in high-quality flue-cured tobacco. Eucommia ulmoides sells well all over the country and is one of the raw lacquer base counties in Yunnan Province.