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.
Basu County, which belongs to Changdu, Tibet Autonomous region, is located in the east of Tibet Autonomous region and southeast of Changdu. It is located in the upper reaches of the Nujiang River. Baima Town, where the county seat is located, is 3260 meters above sea level. It is bordered by Zuogong County and Chaya County to the east, Chayu County to the south, Luolong County and Linzhi City to the west, Karuo District and similar Wuqi County to the north. The county covers an area of 12564.28 square kilometers (2014). The county is 210km long from north to south and 80km wide from east to west. it has jurisdiction over 4 towns and 10 townships, with a total population of 39021 (2010), including 19790 males and 19231 females, with a total of 6999 households. There are Hengduan Mountains in the southwest of Basu County and Nujiang River in the northeast. The climate type is the plateau temperate zone semi-arid monsoon climate, and the county government is located in the town of Baima from the municipal government of Changdu.