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.
Longjing City belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Located in the east of Jilin Province, the southeast of Yanbian Korean Autonomous Prefecture and the eastern foot of Changbai Mountain, it is the forefront of Changji map development and opening up pilot area, an important part of the international cooperation of Tumen River region and the integration of Yanlong map. It is located in the southeast of Jilin Province, at the eastern foot of Changbai Mountain. The geographical coordinates are between 128 °54 °E and 129 °48'E and 42 °21 °N and 43 °24'N. Facing North Korea across the Tumen River in the southeast, the border is 142.5 kilometers long, bordering Yanji City and Tumen City in the northeast, Helong City in the southwest, and Antu County in the northwest. In 2015, Longjing City achieved a GDP of 4.03 billion yuan. As of 2014, Longjing had jurisdiction over 5 towns, 2 townships and 2 streets.