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.
Zhouzhi County, which belongs to Xi'an City, Shaanxi Province, is located in the west of Guanzhong, adjacent to the center line of Baima River in the east, Foping County and Ningshan County in the south, and Mei County and Taibai County in Baoji City in the west. Beipingwei River is adjacent to Wugong County, Xingping City, Yangling District and Fufeng County of Baoji City, between longitude 107o 39mm east and latitude 33 °42m 34 °14', with a total area of 2974 square kilometers and 68 kilometers away from Xi'an. Zhouzhi region is high in the southwest and low in the northeast, with a warm temperate continental monsoon climate. In the territory, there are the birthplace of Taoist culture, Lou Guantai, "the most blessed land in the world" and the birthplace of "Song of everlasting regret".