The East River is the name of the river to the east of Manhattan. Despite being called the East River, in reality it is not really a river. It is a salt water tidal strait or a partially enclosed coastal body of water in New York City. It stretches 26 kilometers and connects Long Island Sound and Upper New York Bay.
A normal inland river only travels in one direction, but the flow of East River changes with the time of day – sometimes heading North East to Connecticut and other times it flows south to New Jersey. Although some people swim in the East River for the annual Brooklyn Bridge Swim, the New York City Department of Environmental Protection released a warning that it is dangerous to swim there because of its heavy pollution. People can only do secondary contact such as fishing and boating.