American English

Definition of Niagara Falls from the Oxford Advanced American Dictionary

 

Niagara Falls

 
NAmE//naɪˌæɡrə ˈfɔlz//
 
 
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a famous waterfall on the Niagara River that joins Lake Erie to Lake Ontario on the U.S.–Canadian border. It actually consists of two sections, the American Falls and the Horseshoe Falls, separated by Goat Island. Both the U.S.A. and Canada have cities called Niagara Falls, on opposite sides of the Niagara River.
See the Oxford Advanced Learner's Dictionary entry: Niagara Falls