• San Francisco
  • Wenchuan 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.

Wenchuan County, which belongs to Aba Tibetan Autonomous Prefecture of Sichuan Province, is located on the eastern edge of the Qinghai-Tibet Plateau, northwest Sichuan Province, Juchuan Northwest Plateau and the southeast of Aba Tibetan and Qiang Autonomous Prefecture. It is 84 kilometers from east to west and 105 kilometers from north to south, with a total area of 4084 square kilometers. The county seat is 1236 meters above sea level. It is 146 kilometers south from the provincial capital Chengdu and 202 kilometers north from the state capital Markang. It has jurisdiction over 9 towns and 3 townships. At the end of 2016, the registered population of Wenchuan County was 97615. Wenchuan is known as "the hometown of Dayu, the home of pandas and the hometown of Qiang embroidery". It is the birthplace of Dayu, the first ancestor of China, one of the four Qiang inhabited counties in China, and the ecological experience area of Qiang culture. Around the tourism brand of "World Wenchuan, Dayu hometown, Panda Home", with Dayu culture, Tibetan and Qiang culture, three Kingdoms culture,
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