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.
Heqing County, Xiazhou County, Dali Prefecture, Yunnan Province, China, is located in the northwest of Yunnan Province, at the southern end of Hengduan Mountains in western Yunnan, to the east of Yunling Mountains, and at the northern end of Dali Bai Autonomous Prefecture, with geographical coordinates of 100 °01 longitude 100 °29 'east longitude and 25 °57 Latitude 26 °42' north latitude. It is bordered by Jinsha River and Yongsheng County in the east, Binchuan County in the south, Jianchuan County and Eryuan County in the west, and Lijiang City in the north. On September 29, 2018, Heqing County was approved to withdraw from the poverty-stricken county after being studied by the Yunnan Provincial Party Committee and the Yunnan Provincial Government. On February 2, 2019, it was rated as a county-level national advanced unit of traditional Chinese medicine by the State Administration of traditional Chinese Medicine. In November 2019, Heqing County was named as the national demonstration county of "Sihao Rural Road".