• San Francisco
  • Hunchun

San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

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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