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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Rivers, the largest of which is the Hudson River, which originates in the Adirondacks and flows south to New York Harbor. From the City north to the Federal Dam at Troy, NY, the Hudson River is a tidal estu- ary. Other rivers include the Bronx River and Hutchinson River.
It ends at New York City near the Atlantic Ocean. This river is called the Hudson. The Hudson River changes during this journey. It begins as fresh water flowing from the mountains.
The East River is a saltwater tidal estuary in New York City. The waterway, which is actually not a river despite its name, connects Upper New York Bay on its south end to Long Island Sound on its north end.
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.
The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.