Greenland's Giant Waterfall
Back in July 2006, Greenland had its own waterfall that flowed at three times the volume of Niagara. The waterfall occurred as the result of a glacier lake suddenly emptying into the sea.
The lake covered 2.2 square miles near the western edge of the ice sheet and took about 24 hours to drain.
During the most rapid 90 minutes, water was flowing out of the lake at 2.3 million gallons per second, according to researchers led by Sarah Das of Woods Hole Oceanographic Institute in Woods Hole, Mass.
Under international convention, the minimum flow of Niagara Falls in summer is about 750,000 gallons per second.
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