THE NORTH AMERICAN FALLS.

Niagara Falls (Tgahnawehta in Northern Iroquoi Language) is the collective name for the 3 WaterFalls that straddle the International Border between Canada and the United States; more specifically, between the Province of Ontario and the State of New York. They form the Southern End of the Niagara Gorge.
The Niagara Gorge is an 11 km (6.8 mi) Gorge carved by the Niagara River along the US-Canadian border in New York and Ontario. While not exceptionally high, they are very wide. More than 6 million cubic feet (168,000 m3) of water falls over the crest line every minute in high flow, and almost 4 million cubic feet (110,000m3) on average.
It begins at the base of Niagara Falls and ends at the Niagara Escarpment (Cliff) near Queenston, Ontario, where the Falls originated about 12,500 years ago when Glaciers receded at the end of the Wisconsin Glaciation (the last ice age), and water from the newly formed Great Lakes carved a path trough the Niagara Cliff en route to the Atlantic Ocean.
The Niagara Escarpment is a long Cliff, or Cuesta, in the USA and Canada that runs predominantly East/West from New York State, through Ontario, Michigan, Wisconsin, and Illinois. The Escarpment is most famous as the Cliff over which the Niagara River plunges at Niagara Falls, for which it is named. The Niagara Cliff is the most prominent of several cliffs formed in the bedrock of the Great Lakes basin. From its Easternmost Point near WaterTown, New York, the cliff shapes in part the individual basins and landforms of Lakes Ontario, Huron, and Michigan.
In Rochester, New York, there are 3 Water Falls over the cliff where the Genesee River flows through the City. The Cliff then runs WestWard to the Niagara River forming a Deep Gorge North of Niagara Falls, which itself cascades over the Cliff.
In Southern Ontario it spans the Niagara Peninsula, closely following the Lake Ontario shore through the Cities of St. Catherine, Hamilton, and Dundas, where it takes a sharp turn North in the Town of Milton toward Georgian Bay.
It then follows the Georgian Bay shore NorthWestWards to form the spine of the Bruce Peninsula and Manitoulin Island, as well as several islands located in Northern Lake Huron where it turns WestWards into the upper peninsula of Northern Michigan, South of Sault Ste. Marie.
It then extends SouthWards into Wisconsin following the Door Peninsula through the BayShore BluffLands and then more inland from the Western Coast of Lake michigan and Milwaukee, ending NorthWest of Chicago near the Wisconsin-Illinois Border.
The 3 Water Falls that straddle the International Border are, from largest to smallest: the HorseShoe Falls, the American Falls and the Bridal Veil Falls.