Hello how may I help you? Where is the tallest indoor waterpark? Do you mean water slide? Waterfall, my apologies. The tallest indoor waterfall is in Singapore. What is called? It doesn't have a name, but it's located in the Cloud Forest. What about the tallest waterfall outdoors? The tallest outdoor waterfall is located in Venezuela? I'm sorry, no question mark. What is it called? These are the Angel Falls.