As for the world's tallest waterslide, it sits a continent away in Barra Do Pirai, Brazil, near Rio de Janeiro at the Aldeia das Aguas Park Resort. Named Kilimanjaro, after the world's largest free-standing mountain, the waterslide is 164 feet tall, according to the Water Slide Database.

As of early 2026, the title for "biggest" depends on whether you measure by height or length. The world's longest water slide is located at ESCAPE Penang in Malaysia, stretching a massive 1,111 meters (over 0.6 miles) down a jungle-covered mountainside; it takes nearly four minutes to complete the ride. For sheer vertical height, the world's tallest water slide is arguably the "Kilimanjaro" at Aldeia das Águas Park Resort in Brazil, featuring a near-vertical drop of 164 feet (50 meters). However, in the United States, the Thrill Madagascar at DreamWorks Water Park in New Jersey holds the record for the tallest indoor slide at 142 feet. Another major contender for 2026 is the Mammoth at Holiday World in Indiana, which holds the record for the longest "water coaster," utilizing specialized magnetic technology to propel multi-person rafts over nearly 1,800 feet of track.