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  • Heishui

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.

Heishui is located in the east of the Qinghai-Tibet Plateau, in the middle of Aba Tibetan and Qiang Autonomous Prefecture, connected with Songpan in the north, Hongyuan and Maoxian in the east and west, Lixian and Malkang in the south and southwest, 284km away from the provincial capital Chengdu, and the county seat is 2350 meters above sea level. Heishizang is called "Cuoqu", which means "water of pig iron". Heishui River is a tributary of the upper reaches of Minjiang River. There are 99 small Heishui River, Mauergai River and gully. Heishui territory of the natural scenery Jun Xiu, strange, unique cultural scenery. There are mainly three Olympic Snow Mountains, Custer Landscape, Dagu Glacier, the lowest, largest and youngest glacier in the world at the same latitude, the Milk ditch Colored Forest, known as the 80-mile Gallery, Selgu Tibetan Village and other unique Tibetan dwellings, and Yaxia National Forest Park. Heishui is the place passed by the Red Army on the long March.
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