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.
Shiquan County is located in the west of Ankang City, Shaanxi Province, with Qinling Mountains and Nanqianba Mountain in the north, located in the hinterland of Qinba and the bank of Han River, with a total area of 1525 square kilometers. It is a national key county for poverty alleviation and development. Shiquan County was founded in the first year of Emperor Fei in the Western Wei Dynasty (AD 525). It was named because of "many springs in the stone gap in the south of the city and endless runoff". Shiquan County is a national health county and provincial garden county; it is an important destination of Qinba Han River eco-tourism, known as "Qinba landscape, Shiquan ten beauties"; it is the first sericulture industry county in the west, known as "the source of the Silk Road and the hometown of golden silkworms"; it is an important water conservation place for the national south-to-north water transfer and an important electric energy base in the west. It is an important birthplace of pre-Qin culture. Gui Guzi, the ancestor of the vertical and horizontal school, practiced and taught his apprentice in Shiquan County, also known as the hometown of Gui Guzi.