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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.

Tacheng: the county-level city under the jurisdiction of Tacheng area of Yili Prefecture, Xinjiang, is located in the northwest of Xinjiang Uygur Autonomous region and the Tacheng basin on the northwest edge of Junggar Basin, with a total area of 4356.6 square kilometers. It is bordered by the Republic of Kazakhstan in the northwest, Emin County in the east and Yumin County in the south. It is 530 kilometers to the east from Urumqi, the capital of the autonomous region, and only 12 kilometers to the west from the first-class national port, Baktu Port. It is one of the closest open cities in China to the border. Tower is referred to as "Tarbatai" (Mongolian marmot). Tacheng is the seat of the Tacheng Prefectural Committee of the Communist Party of China and the administrative office of Tacheng area. In 1984, the county was removed and the city was established. In 1992, it was listed as a further open city along the border by the State Council. In June 1992, with the approval of the State Council, the national border was established.
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