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.
Weinan, a prefecture-level city under the jurisdiction of Shaanxi Province, is located in the eastern part of Guanzhong Plain and eastern Shaanxi Province. The topography takes the Weihe River as the axis, forming five geomorphological types of the north and south mountains, the two tableland and the central Pingchuan, which belongs to the warm temperate semi-humid semi-arid monsoon climate. The city has a total area of 13030 square kilometers and has jurisdiction over 2 districts, 2 county-level cities and 7 counties. In 2017, the permanent population is 5.3829 million. The Yellow River in the south and east of Weinan is adjacent to Yuncheng of Shanxi and Sanmenxia of Henan, Xi'an and Xianyang to the west, Qinling to the south and Shangluo to the south, and Qiaoshan to the north to Yan'an and Tongchuan. It is 60 kilometers away from the ancient city of Xi'an and 80 kilometers away from Xianyang International Airport. Two high-speed railways from Zhengxi and Daxi meet at this station. Six railways, including Longhai and Southwest, are vertical and horizontal with three expressways, including Lianhuo, Jingkun, and nine national highways and provincial highways.