what is niagara falls
1 . ( Placename ) ( functioning as plural ) the falls of the Niagara River , on the border between the US and Canada between Lake Erie and Lake Ontario : divided by Goat Island into the American Falls , 50 m ( 167 ft ) high and approximately 300 m ( 985 ft ) wide , and the Horseshoe or Canadian Falls , 47 m ( 158 ft ) high and by some estimates well ...