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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.

Qionghai, a county-level city in Hainan Province, is located in longitude 110 °7'5 "~ 40 °50 °quot; latitude 18 °58 °50 °quot; north latitude 18 °58 °35 °quot; It is located in the east of Hainan Province, the middle and lower reaches of Wanquan River, 78 kilometers north of Haikou City, 60 kilometers south of Wanning City, 163 kilometers of Sanya City, Dingan County and Tunchang County in the west, and Qinglan Port in Wenchang to the east. Qionghai has a total area of 1710 square kilometers. in 2016, Qionghai had a resident population of 506100, and about 550000 overseas Chinese, Chinese, and compatriots from Hong Kong, Macao and Taiwan, distributed in 28 countries and regions on five continents. The city has jurisdiction over 12 towns and the Bincun Mountain overseas Chinese Economic Zone, which also has three state-owned farms and one state-owned forest farm. In 2017, Qiong Haisheng
Airport In Qionghai City - Qionghai Boao Airport
Qionghai Boao Airport (Qionghai Boao Airport, IATA: BAR, ICAO: ZJQH), located in Zhongyuan Town, Qionghai City, Hainan Province, China, 12 kilometers away from Qionghai City, 15 kilometers away from Boao International Conference Center, the flight area level is 4C level is a key supporting project of the Boao Forum for Asia.  
Qionghai Boao Airport was officially opened to navigation on March 17, 2016, and was named Qionghai Boao Airport. In April 2016, the airport launched the second-phase expansion project; in March 2017, the second-phase expansion project of the airport was completed and accepted.  
According to the information on the airport's official website in January 2019, Qionghai Boao Airport has two terminals, China's domestic (9900 square meters) international and Hong Kong, Macao and Taiwan (6848 square meters), with a 3200-meter runway and 52 aircraft seats. The aircraft used are Boeing B737-800 and Airbus A320.    
In 2020, the passenger throughput of Qionghai Boao Airport was 562,900 passengers, a year-on-year increase of 0.7%; the cargo and mail throughput was 552.6 tons, a year-on-year increase of 3.6%; bit, 137th, 109th.  
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