• San Francisco
  • Lixian 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.

Lixian County is located on the eastern edge of the Qinghai-Tibet Plateau and in the southeast of Aba Tibetan and Qiang Autonomous Prefecture. It is located at 30 °54km north latitude 31 °12km north longitude 102 °32m mi 103 °30' east longitude. It is bordered by Maoxian and Heishui in the northeast, Xiaojin in the southwest, Wenchuan in the southeast, Malkang and Hongyuan in the northwest, 202km away from the provincial capital Chengdu, 193km away from the state capital, and the county seat is 1888 meters above sea level. The geological structure of Lixian County belongs to the middle part of Longmenshan fault zone, with undulating mountains, an average elevation of 2700 meters, and a three-dimensional climate of mountain type, with more precipitation in spring and summer, short frost-free period in winter, annual rainfall between 650 ℃ and 1000 mm, and annual average temperature of 6.9 ℃-11 ℃ in the valley. Lixian County has great advantages in tourism resources. There is a natural ecological scene with beautiful scenery
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