World Waterpark is the world’s largest indoor waterpark with a size of roughly 30 acres. The World Waterpark opened to public in 1986. It is located in the West Edmonton Mall in Edmonton, Alberta, Canada. It has a maximum capacity of 40,000 guests, an average temperature for the water of 30-33 °C (86-89 °F), and is the world’s largest indoor wave pool holding 12.3 million litres. The highest slides in the park are Twister and Cyclone, which are both 83 feet (25 m) high.