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.
Mianxian, a county under the jurisdiction of Hanzhong City, Shaanxi Province, is located in the south of Shaanxi Province, the western end of Hanzhong Basin, Qinling Mountains in the north, Nanyuan Ba Mountain, Juchuan, Shaanxi and Ganzhong. The county has jurisdiction over 19 towns and 242administrative villages, with an area of 2406 square kilometers and a total population of 428100 (2014). Mianxian County is rich in resources, unique biological resources, warm and humid climate, the largest tributary of the Yangtze River runs through the whole territory, the basin beads in the territory, and the forest coverage rate reaches 58%. Mianxian County, with large reserves and high grade of mineral resources, is located in the "Mianluoning" Golden Triangle and is praised as the "Ural" of Asia by geologist Li Siguang. It is an important metallurgical and chemical industry base in Hanzhong City, Shaanxi Province. September 25, 2018, won the honor of "2018 e-commerce into the rural comprehensive demonstration county" of the Ministry of Commerce.