• San Francisco
  • Xihe 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.

Xihe County belongs to Longnan City, Gansu Province, located in the southeast of Gansu Province, the northern end of Longnan City, because of the ancient West and the state and the county name. In the Western Han Dynasty, he bought Wudu County in Luoyu (now Luoyu Town), Qiu Chi State in the two Jin dynasties, South Qinzhou in Luoyu in the Northern Wei Dynasty, and changed it into a state in the Western Wei Dynasty. After many changes, Minzhou was changed to Xihe Prefecture in the Southern Song Dynasty, and Xihe Prefecture became a county in the Hongwu period of the Ming Dynasty. Xihe County has jurisdiction over 16 towns and 4 townships, covering an area of 1861 square kilometers and a total population of 437633 (2015). Xihe County is located in the south of the West Qinling Mountains and the upper reaches of the Jialing River system in the Yangtze River Basin. It is a warm temperate semi-humid climate with four distinct seasons. Xihe County is known as the "precious rehabilitation zone". The natural resources are mainly represented by antimony ore, lead-zinc ore and Pinellia ternata and Zanthoxylum bungeanum.
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