Niagara Falls is one of the largest and most well known natural waterfall ranges. The falls are located on the Niagara River on the international borderline between the cities of Niagara Falls, New York (United States) and Niagara Falls, Ontario (Canada).
Niagara Falls is comprised of Horseshoe Falls and the American Falls. Horseshoe Falls are about 2,600 feet wide, and is about 173 feet from the top of the falls to the bottom. The American Falls are about 1,060 feet wide, and flows about 70 feet from top to bottom.
More than 750,000 gallons of water per second thunder down this iconic 167-foot waterfall—the most powerful on the North American continent. The falls straddle the border between the U.S. and Canada, and though some argue that Horseshoe Falls—set on the Ontario side—is more spectacular than the smaller American Falls, the landmark has held a particular place in American history ever since 1901, when Michigan schoolteacher Annie Edson Taylor was the first person to go over the falls (and survive) in a barrel. 
The falls have been a source of hydroelectric power for many years.