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.
Tibet is called "Tibet" for short. The Tibet Autonomous region, the capital of Lhasa, is located on the southwest border of the people's Republic of China and is one of China's five ethnic minority autonomous regions. Tibet is located in the southwest of the Qinghai-Tibet Plateau, between 26 °50'N and 36 °53 °N, 78 °25'E and 99 °06'E, with an average elevation of more than 4000 meters. Tibet is known as the "roof of the world". The land area is 120218947.91 hectares, accounting for about 1% of the country's total area, second only to Xinjiang in all provinces, municipalities and autonomous regions. At the end of 2018, the resident population was 3.4382 million. Tibet is bordered by Xinjiang in the north, Sichuan in the east, Qinghai in the northeast and Yunnan in the southeast. It is bordered by Myanmar, India, Bhutan, Nepal, Kashmir and other countries and regions.