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.
Wangqing County belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Its geographical location is between 129 °51 Mel 130 °56'E and 43 °06 Mel 44 °03'N. It is bordered by Hunchun City in the east, Dunhua City in the west, Tumen City and Yanji City in the south, and Ning'an, Muling and Dongning counties in Heilongjiang Province in the north. The north-south length is 108 kilometers, and the east-west horizontal distance is 152 kilometers. Wangqing County has jurisdiction over 8 towns and 1 township. Wangqing County is 40 kilometers from the Russian border and 18 kilometers from the North Korean border. Wang Qing is located in the foothills of Changbai Mountain, which belongs to the mountain area, with an average elevation of 806 meters. It belongs to the continental mid-temperate windy climate, with long winter and short summer, four distinct seasons and great vertical variation. The annual average temperature is 3.9mm, the annual average rainfall is 580mm, the frost-free period is 110141days, and the annual sunshine.