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.
Shangnan-the cover of the Great Qinling Mountains, also known as "Lucheng", has a long history, picturesque, exquisite and handsome, beautiful ecology, rich heritage, is a natural oxygen bar in China, the southeast gate of Shaanxi, the only 5A scenic spot in southern Shaanxi-Jinsi Grand Canyon is located here. Shangnan, the famous hometown of Chinese tea and famous tea in China, the best cultural and eco-tourism county in China, the natural oxygen bar in China, the hometown of Chinese folk culture and art, the most beautiful county in China, and the famous eco-tourism county in the western region, it is known as the "Pearl of Southern Shaanxi" and "Qinling cover". Its national geographical indication product "Shangnan Tea" and rich cultural and ecological tourism have made it increasingly prosperous, and its county seat is known as "the most beautiful county seat in the Qinling Mountains". Shangnan, located at the southern foot of the eastern part of Qinling Mountains and on the north slope of Dabashan Mountain, belongs to the Han Dynasty in the Yangtze River Basin.