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Niagara River - Wikipedia
Niagara River | Map, Gorge, Depth, & Facts | Britannica
Niagara River - WorldAtlas
Niagara Falls - Wikipedia
Niagara River | The Canadian Encyclopedia
Niagara River summary | Britannica
Niagara Gorge - Wikipedia
Niagara Falls | Facts, Geology, & History | Britannica
Niagara Falls | About | Nature | PBS
Niagara Falls National Heritage Area - U.S. National Park Service