• San Diego
  • Hunchun

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.

Hunchun City, which belongs to Yanbian Korean Autonomous Prefecture of Jilin Province, is located in the east of Jilin Province and southeast of Yanbian Korean Autonomous Prefecture. Hunchun is bordered by Hunchun Ridge and Hassan District of Russia's coastal border region. The total length of the border is 246km. The southwest is bounded by the Tumen River and is adjacent to Hamgyong North Road of North Korea. The total length of the border is 139.5 km. The north is bounded by Laoyeling and adjoins Wangqing County, the northwest corner is connected with Tumen City, and the northeast is adjacent to Dongning City, Heilongjiang Province. It is between longitude 130o 03m 21 "- 130o 18m 33" east and latitude 42o 25m 20 "- 43o 30m 18" north, with a total area of 5145 square km. Hunchun is the only border city in China located at the junction of China, North Korea and Russia, because it is at the core of international cooperation and development in the Tumen River region.
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