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Washington, D.C., formally the District of Columbia, also known as Washington or D.C. or locally simply as the District, is the capital city and federal district of the United States. It is located on the east bank of the Potomac River, which forms its southwestern and southern border with the U.S. state of Virginia, and it shares a land border with the U.S. state of Maryland on its other sides. The city was named for George Washington, a Founding Father and the first president of the United States, and the federal district is named after Columbia, the female personification of the nation. As the seat of the U.S. federal government and several international organizations, the city is an important world political capital. It is one of the most visited cities in the U.S., with over 20 million annual visitors as of 2016.

The U.S. Constitution provides for a federal district under the exclusive jurisdiction of Congress; the district is not a part of any U.S. state (nor is it one itself). The signing of the Residence Act on July 16, 1790, approved the creation of the capital district located along the Potomac River near the country's East Coast. The City of Washington was founded in 1791, and Congress held its first session there in 1800. In 1801, the territory, formerly part of Maryland and Virginia (including the settlements of Georgetown and Alexandria), officially became recognized as the federal district. In 1846, Congress returned the land originally ceded by Virginia, including the city of Alexandria; in 1871, it created a single municipal government for the remaining portion of the district. There have been efforts to make the city into a state since the 1880s, a movement that has gained momentum in recent years, and a statehood bill passed the House of Representatives in 2021.

Huancui District, which belongs to Weihai City, Shandong Province, is located at the easternmost end of Shandong Peninsula, surrounded by the sea on three sides, facing the Korean Peninsula and Japanese islands in the east, with a total area of 276.21 square kilometers and a coastline of about 43 kilometers. It is the city closest to China and South Korea in a straight line. Huancui District is the residence of Weihai government and the central city of Weihai. In the 31 year of Hongwu of the Ming Dynasty (1398), the Ming Dynasty set up guards and stationed troops here to prevent Japanese aggression, which was called Weihaiwei. By the end of 2018, Huancui District had jurisdiction over 5 streets and 3 towns with a resident population of 365800, achieving a GDP of 39.59 billion yuan, of which the added value of the primary industry, the secondary industry and the tertiary industry was 3.01 billion yuan, 14.897 billion yuan and 21.684 billion yuan, respectively.
Airport In Huancui Area - Weihai Dashuibo International Airport
Weihai Dashuibo International Airport (Weihai Dashuibo International Airport, IATA: WEH, ICAO: ZSWH), located in Weihai City, Shandong Province, China, about 40 kilometers away from the center of Weihai, is a 4D-level military-civilian airport    .
Weihai Dashuibo Airport was completed and opened to navigation; on October 30, 1995, Weihai Dashuibo Airport was upgraded to a 4D-level airport; on September 30, 2004, Weihai Dashuibo Airport was approved to open to the public, and then changed its name to "Weihai Dashui Park International Airport"   .
As of December 14, 2016, Weihai Dashuibo International Airport has a runway of 2,600 meters, an apron construction area of ​​36,000 square meters, a terminal building of 14,000 square meters, and an air traffic control building of 1,700 square meters. The designed passenger throughput capacity of the airport is 1.4 million person-times/year, of which the international passenger volume is 500,000 person-times/year, and the cargo capacity is 50,000 tons/year   .
In 2019, the passenger throughput of Weihai Dashuibo International Airport completed 3 million passengers, a year-on-year increase of 23%, ranking 60th in the country; the cargo and mail throughput was 9,228.081 tons, a year-on-year increase of 36.4%, ranking 77th in the country; flight movements were 25,694 Flights, a year-on-year increase of 23.0%   .
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