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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Nangqian County, which belongs to Yushu Prefecture, Qinghai Province, is located in longitude 95 °21 "58" ~ 97 °07 "0" east and latitude 31 °32 "20" ~ 32 °43 "46" north. It is adjacent to Haixi Mongolian Tibetan Autonomous Prefecture in the north, Guoluo Tibetan Autonomous Prefecture in the east, Ganzi Tibetan Autonomous Prefecture in Sichuan Province to the southeast, and Changdu in the Tibet Autonomous region to the south. The longest is 157.5 kilometers from east to west, and the widest from north to south is 130.5 kilometers, with a total area of 12741 square kilometers. In 2013, the total population of Nangqian County was 130000, including Tibetan, Han, Hui, Tu and other ethnic minorities. Nangqian County has gold, silver, copper, iron, lead, zinc, tin, gypsum, sulfur, limestone, coal, salt and other mineral resources. In 2013, the gross domestic product of Nangqian County reached 7.449 billion yuan.
Travel Guides In Nangqian County
Travel Notes In Nangqian County
#唐菲古道# On the third day of entering Tibet, staying overnight in the rain is not unexpected⑥
DAY3: Nangqian - Baizha Forest Farm If there is no plan and corresponding preparations, those trips that just go away are mostly gimmicks, and the sce
Chaka Salt Lake is known as the mirror of the sky in China. There is also a salt production area in Qinghai, which has a longer history.
On the 80-kilometer journey from Nangqian County to Gaer Temple, Baizha Salt Field is a must. Nangqian County, Qinghai Province is located in the famo
The 2,000-year-old underground palace has never been opened. Tibetans regard it as a holy place, and tourists "step on it at will"
The Lancang River flows slowly, and the golden Buddha stands between the heaven and the earth. He gazes at the world and prays for blessings. The clea