Hello how may I help you? Can you tell me where the tallest indoor waterfall is located? One moment while I search for Tallest Indoor Waterfall. Ok I see that the tallest indoor waterfall is located at Gardens By the Bay in Singapore. Would you like anything else? Where is the tallest waterfall of any kind? The tallest waterfall on Earth is Angel Falls in Venezuela. Can I help with anything more? About how tall is that one? Angel Falls is 3230 feet, with an uninterrupted drop of 2647 feet. Would you prefer that in metric? No. That's enough. Thanks for your help Any time!