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.
Pingxiang City, a county-level city in Guangxi Zhuang Autonomous region, is hosted by Chongzuo City, located in southern China, bordering Lang Shan in Vietnam, known as "the south gate of the motherland", and is the international city closest to ASEAN countries in China. It has four towns under its jurisdiction, with a land area of 650 square kilometers and a population of more than 100,000. Pingxiang City is 160 kilometers away from Nanning, the capital of Guangxi, and Hanoi, the capital of Vietnam (expressway), and borders with Vietnam's Liangshan Province on both sides of the southwest. The border line is 97 kilometers long. In the border area, there are two national first-class ports (highway) and Pingxiang port (railway), one second-class port and five border cities. It is the border port city with the largest number, the most variety and the largest scale of Guangxi ports. It is the largest and most convenient land passage from China to Vietnam and Southeast Asia. 1992 6