• San Francisco
  • Nan'ao County

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.

Nanao County, which belongs to Shantou City, Guangdong Province, is located on the sea surface at the junction of Fujian, Guangdong and Taiwan provinces, between longitude 116o 53km east and latitude 23 °11pm. Nanao County is composed of Nanao Island and 33 surrounding islands, of which the main island is 110.89 square kilometers and the sea area is 4600 square kilometers with a total area of 113.8 square kilometers. Nanao County is the closest point in Guangdong province to Taiwan Province, 162 nautical miles from Kaohsiung, at the center of the three major ports of Kaohsiung, Xiamen and Hong Kong, and only 7 nautical miles away from the main international route in the Pacific Ocean. It is known as "Chaoshan barrier, Fujian and Guangdong throat". Nanao County is the only island county in Guangdong, and it is also the only national 4A tourist area among China's island counties (districts). It has a superior geographical location. Nanao has been along the southeast since ancient times.
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