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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.

Gongshan Dulong Nu Autonomous County (Gongshan County) is an autonomous county under Nujiang Lisu Autonomous Prefecture, Yunnan Province. Located in the northern section of Nujiang Grand Canyon in northwestern Yunnan, it is located between longitude 98 °08mo 98 °56km east and latitude 27 °29km Latitude 28 °23'. It is connected with Deqin and Weixi counties in Yunnan Province in the east, Fugong County in Nujiang Prefecture in the south, Chayu County in the Tibet Autonomous region in the north and Myanmar Union in the west. The border is 172.08 kilometers long and covers an area of 4506 square kilometers. In 2007, Gongshan Dulong Nu Autonomous County achieved a gross national product of 235.2 million yuan. The main scenic spots of Gongshan Dulong Nu Autonomous County are Biluo Snow Mountain, Gaoligong Mountain, Dandanglika Mountain, Nujiang River, Dulong River and so on. On September 25, 2018, the Ministry of Commerce was awarded "2018"
Travel Sights In Derung-Nu Autonomous County Gongshan
Travel Notes In Derung-Nu Autonomous County Gongshan