Manhattan Island

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Manhattan Island (or Manhattan) contains the geographically smallest, but most densely populated borough, of New York City. Manhattan consist of Manhattan Island and several small adjacent islands: Roosevelt Island, Randall's Island, Wards Island, Governors Island, Liberty Island, part of Ellis Island, Mill Rock, and U Thant Island; as well as Marble Hill, a small area on the mainland bordering the Bronx. The original city of New York began at the southern end of Manhattan, expanded northward, and then between 1874 and 1898, annexed land from surrounding counties.

Manhattan is the site of the Manhattan Island Marathon Swim, a highly popular marathon swim and relay held annually in June. The circumnavigation around Manhattan Island is one leg of the Triple Crown of Open Water Swimming.



Complete circumnavigation around Manhattan Island in New York City, New York, U.S.A.


Counter-clockwise circumnavigation of Manhattan Island, starting and finishing near Wall Street.


28.5 miles (45.8 km)


Manhattan Island Marathon Swim is limited in the number of solo swimmers and relay teams in its annual race. The race starts and finishes at Battery Park City. Race sells out in less than 45 minutes. The race was first held in 1927. Substantial surface chop and strong tidal pull are possible. Water temperature varies between 64-67°F (17-19°C). Salt water around Manhattan Island may also include random jetsam and flotsam. A Qualifying Swim must be completed before application will be accepted. The premier event of the NYC Swim Series that conducts numerous other open water events and has attracted over 14,000 participants in more than 110 events.

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