Hello how may I help you? Can you help me with some information? I sure can. What would you like to know? I would like to know where the tallest indoor waterfall is The tallest indoor waterfall is located in Dubai, in the atrium of the Desert Grand Hotel How tall is it? It is 300 feet tall Wow!! Where is the tallest waterfall in the world? The tallest natural waterfall in the world is Niagra falls in New York Thanks for the info!! No problem. Is there anything else I can help you with? Nope, that's it. Thanks again!