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.
Changwu County, which belongs to Xianyang City, Shaanxi Province, is located in the west of Guanzhong and on the south side of the middle reaches of Jinghe River in the northwest of Xianyang City. It is adjacent to Bin County in the east, Lingtai County in Gansu Province to the south, Jingchuan County in Gansu Province to the west, and Ningxian County and Zhengning County in Gansu Province to the north. Between longitude 107 °38 "49"-107 °58 "02" east and latitude 34 °59 °09 "- 35 °18" 37 "north. The longest point from north to south is 30.06km, and the widest from east to west is 27.23km, with a total area of 567.1 square kilometers. In 2018, Changwu County has jurisdiction over 1 street and 7 towns. At the end of 2016, the resident population of Changwu County was 170878, with a regional gross domestic product (GDP) of 7.2999 billion yuan, of which the added value of the primary industry was 15.86.