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.
Lintong District, which belongs to Xi'an City, Shaanxi Province, is located in the east of Guanzhong Plain, Lantian County in the south, Yan Liang District in the north, Sanyuan County in Xianyang City in the northwest, Gaoling District in the west, Linwei District in Weinan City in the east, and Baqiao District in the southwest. Between longitude 109 °05 "49"-109 °27 "50" east and latitude 34 °16 "49"-34 °44 "11" north, with a total area of 915 square kilometers. The famous "eighth Wonder of the World" Qin Shihuang Terracotta Warriors and horses, the source of "Beijing time", the National time Service Center of the Chinese Academy of Sciences is located in Lintong District. From the Zhou and Qin dynasties to the Han and Tang dynasties, Lintong has always been the capital, at the center of China's political, economic and cultural activities. There are many historical heritages in the territory, including the Jiangzhai site during the Yangshao Culture period and Lishan Mountain where the beacon fire opera princes took place.