Niagara Falls Extracted from “Oxford Junior Encyclopaedia”(Vol. III)

<正> These mighty falls are one of the great natural wonders of the world although they are not, in fact, nearly the highest in the world - the Kaieteur Falls, for instance, in British Guiana being five times as high. They are partly in Canada and partly in the United States, as the boundary between the two countries follows the River Niagara. This flows from Lake Erie into Lake Ontario, and in its course