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Baltimore (/ˈbɔːltɪmɔːr/ BAWL-tim-or, locally: /bɔːldəˈmɔːr/ bawl-da-MOR or /ˈbɔːlmər/ BAWL-mər) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was designated an independent city by the Constitution of Maryland[a] in 1851, and today is the most populous independent city in the United States. As of 2021, the population of the Baltimore metropolitan area was estimated to be 2,838,327, making it the 20th largest metropolitan area in the country. Baltimore is located about 40 miles (64 km) north northeast of Washington, D.C., making it a principal city in the Washington–Baltimore combined statistical area (CSA), the third-largest CSA in the nation, with a 2021 estimated population of 9,946,526.

Prior to European colonization, the Baltimore region was used as hunting grounds by the Susquehannock Native Americans, who were primarily settled further northwest than where the city was later built. Colonists from the Province of Maryland established the Port of Baltimore in 1706 to support the tobacco trade with Europe, and established the Town of Baltimore in 1729. The first printing press and newspapers were introduced to Baltimore by Nicholas Hasselbach and William Goddard respectively, in the mid-18th century.

The Battle of Baltimore was a pivotal engagement during the War of 1812, culminating in the failed British bombardment of Fort McHenry, during which Francis Scott Key wrote a poem that would become "The Star-Spangled Banner", which was eventually designated as the American national anthem in 1931. During the Pratt Street Riot of 1861, the city was the site of some of the earliest violence associated with the American Civil War.

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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