A rainbow over a waterfall with a rainbow in the sky

Niagara Falls，The largest waterfall in the world，The water flow of this waterfall is very large，Because the height is very high compared to other waterfalls，而且Niagara Falls的占地面积非常的广阔，The rumbling sound of water flow can be heard up to 30 kilometers away from the waterfall.，The overwhelming sound of this huge waterfall，It can be said to be one of the wonders of the world。national geographic，photography，horseshoe falls canada

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