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.
Yanbian Korean Autonomous Prefecture, the only autonomous prefecture in Jilin Province, is the capital of Yanji City. Located in the border between China and North Korea in the east of Jilin Province in northeast China, the whole terrain is high in the west and low in the east, tilting from the southwest, northwest and northeast to the southeast, located in the mid-temperate zone of the Northern Hemisphere, belonging to the mid-temperate humid monsoon climate. The state has a total area of 43300 square kilometers and has jurisdiction over 6 cities and 2 counties with a population of 2.1014 million in 2017. Yanbian Korean Autonomous Prefecture has 11 ports to North Korea and Russia, and the port cargo volume accounts for more than 90% of Jilin Province; there is an international airport with direct flights to first-tier cities in the north, Guangzhou and Shenzhen, and countries around the Sea of Japan. The Tumen River is the only waterway for China's inland to enter the Sea of Japan. Yanbian is China's only Korean autonomous prefecture and the largest Korean-inhabited area, accounting for 42. 5% of China's Korean population.