The fresh water that plunges over Niagara Falls drains approximately 684,000 square kilometres ( 264,00 square miles) from four Great Lakes-Lakes Superior, Huron, Michigan and Erie.

Once it flows over the falls, it travels along the lower Niagara River another 21.7 km. (13- 1/2 miles) to Lake Ontario. From there, it travels down the St. Lawrence River to the Atlantic Ocean.

Another bit of trivia, One-fifth of the worlds surface fresh water flows down the Niagara River.

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