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East River
The East River is a salt water tidal strait 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. 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''.〔Montrésor, John (1766). ''(A plan of the city of New-York & its environs )''. London.〕 The tidal strait changes its flow direction frequently.
==Formation==
The strait was formed approximately 11,000 years ago at the end of the Wisconsin glaciation. The distinct change in the shape of the strait between the lower and upper portions is evidence of this glacial activity. The upper portion (from Long Island Sound to Hell Gate), running largely perpendicular to the glacial motion, is wide, meandering, and has deep narrow bays on both banks, scoured out by the glacier's movement. The lower portion (from Hell Gate to New York Bay) runs north-south, parallel to the glacial motion. It is much narrower, with straight banks. The bays that exist (or existed before being filled in by human activity), are largely wide and shallow.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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