Niagara falls will disappear 50

Niagara falls is along the Niagara River
Niagara Falls is on the Niagara River.

Niagara Falls flows between Niagara Falls and Niagara Falls.

The water at Niagara Falls drops -- from the crest of the falls to the bottom of the falls.

The Niagara River flows from Lake Erie to the crest of the falls, over the falls, and thence to Lake Ontario. The Niagara River forms part of the international boundary between Canada and the US.

There are two cities at Niagara Falls, and both are named Niagara Falls. The one in Canada is Niagara Falls, Ontario, and the one in the US is Niagara Falls, New York.

Where is the Niagara Falls ?

Niagara falls is a good example of