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The worlds tallest water slide Insano stands at a staggering height of 41 meters (134.5 ft) with an approximate drop time of 4-5 seconds. Riders can reach a speed of 105 km/h (65.2 mph). The rise can be found at Beach Park aqua park and resort in Fortaleza, Brazil.
World's Highest Water Slide Has a Crazy Long Ad to Match Beach Park, a water park in Brazil, has the highest water slide in the world—an insane 14-story-tall structure called, appropriately enough, Insano. The fearless riders on Insano reach speeds of 65 miles an hour before slamming into a pool at the bottom. It's scary just watching video of people going down this thing. Fittingly, the ride has been promoted with a pretty insane advertisement, too.
I don't know where this is, unfortunately the link just leads to a tumblr site. But it looks like the canals in Hawaiia, maybe Kuai or around Hana Maui