The East River is not a river but a tidal strait, in New York City. It connects Upper New York Bay on its south end to Long Island Sound on its north end. It separates Long Island – including the boroughs of Queens and Brooklyn – from the Bronx on the North American mainland, and the island of Manhattan. Because of its connection to Long Island Sound, it was once also known as the Sound River. The tidal strait changes its flow direction frequently.
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