• San Francisco
  • Huaiji 

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.

Huaiji County, which belongs to Zhaoqing City, Guangdong Province, is located in the northwest of Guangdong Province, the north of Zhaoqing City and the upper reaches of Suijiang River, a tributary of Beijiang River. It is located in the uplift belt of western Guangdong, with basin areas in the west, low hills and high hills in the middle and south, with a subtropical climate, long summer and short winter, abundant rainfall, and an annual average temperature of 21.1℃. With a total area of 3554.07 square kilometers, it is the largest county in Zhaoqing County. As of 2017, Huaiji County has jurisdiction over 18 towns and one nationality township, with a registered population of 1.1 million and a resident population of 848400. Huaiji County was established in Yintun Township, Sihui County, Nanhai County in the 13th year of Song Yuanjia of the Southern Dynasty (436 years). The Song Dynasty formed the basic realm of today's Huaiji County. The Yuan Dynasty was transferred to Hezhou, Huguangzhong Book Co., Ltd. The Ming Dynasty was transferred to Wuzhou Prefecture in Guangxi. It was assigned to Guangdong Province in March 1952 and Zhao in 1988.
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