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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.

Qingtongxia City belongs to Wuzhong City, Ningxia Hui Autonomous region. It is located in the upper reaches of the Yellow River, in the middle of Ningxia Plain, between 105 °21'E longitude and 106 °21'E and 37 °36'N latitude to 38 °15'N. The Yellow River faces Lingwu City and Litong District of Wuzhong City in the east, Zhongning County, Zhongwei City in the south, Alashan Zuo Banner in Inner Mongolia Autonomous region in the west, and Yongning County in the north. Qingtongxia is 30 kilometers away from Litong District, where Wuzhong City is based, and 54 kilometers away from Yinchuan, the capital of the autonomous region. The city is more than 30 kilometers wide from east to west and more than 60 kilometers from north to south, with a total area of 2445 square kilometers. The total population is 283842 (2016). The government is stationed in Xiaoba town. In July 2003, the town was evacuated and the location of the municipal people's government was renamed Yumin Street.
Travel Notes In Qingtongxia City
Qingtongxia Grand Canyon, Zhongwei Shapotou 2-day tour
v After the four-day tour in Yinchuan City, I took a car directly to Qingtongxia Town on the afternoon of May 18th. The whole sky was gray that day, a
Go to Ningxia for a meeting
I didn't expect to go to Qingtongxia for a meeting. This business trip is also a temporary extra task. I don't have much hope. If I want to travel on
Ningxia September tour beyond expectations
The majestic Helan Mountain, the rolling Yellow River, meanders the Great Wall of Ming Dynasty. The desert is connected to the lake, and the ancient
Ningxia Yellow River Grand Canyon, unparalleled 108 towers in the world, with Dujiangyan in the south and Qingtong Gorge in the north, nourishing the south of the Yangtze River and witnessing the water conservancy culture
I took the train to Lanzhou and passed Ningxia more than 20 years ago. I clearly remember that there was a stop at Qingtongxia. I saw a water conserva