Alangkarn Waterfall is an indoor waterfall 15 meters tall in the Alangkarn Zone on the 6th floor of Iconsiam in Bangkok. Lights and colors shift through the falling water, forming letters and patterns, with a 15-minute show every hour. The waterfall can be viewed from tables next to the Starbucks on the 6th floor or on the balcony side. Operating hours are separate, so the time of a visit needs to be checked.