Hudson River, river in New York state, U.S. It flows almost entirely within the state, the exception being its final segment, where it forms the boundary between New York and New Jersey for 21 miles (34 km).
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The Hudson River separates Manhattan from New Jersey. The East River separates Manhattan from Brooklyn and Queens while the Harlem River separates the Bronx from Manhattan.
Technically it's legal to swim in the East River, although it's also strictly forbidden to actually enter the river. Legalities aside, Mike Dulong, senior attorney for the New York water quality advocacy group Riverkeeper, claims that the East River isn't as unsanitary as the average New Yorker might assume.
The short answer is “Yes!” The long answer is that it depends on when and where. Issues like sewage outflow and algal blooms keep many areas along the Hudson from being swimmable, particularly after rainfall.
Lower Manhattan, also known as Downtown Manhattan or Downtown New York City, is the southernmost part of Manhattan, the central borough for business and culture.
It is not safe for swimming, fishing or boating especially in rainstorms. The Harlem River, a 9.3 mile long natural straight, connects the Hudson and East Rivers in New York City.