East River
 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 island of Manhattan and the Bronx on the North American mainland. In reference to its connection to Long Island Sound it was once also known as the Sound River. The tidal strait changes its flow direction frequently.