Seagaia Ocean Dome
The Seagaia Ocean Dome (シーガイアオーシャンドーム, Shīgaia Ōshan Dōmu) was one of the world's largest indoor waterparks, located in Miyazaki, Japan. == Layout == The Polynesia-themed Ocean Dome, which was part of the Sheraton Seagaia Resort, with the world's biggest retractable roof, which was opened and closed according to the weather conditions; 12,000 square metres of sandy beach, crushed from 600 tonnes of stones; an "ocean" six times larger than an Olympic pool, filled with 13,500 tonnes of unsalted, chlorinated water kept hot at 28 °C, equipped with a wave-machine with 200 variations, and listed in the Guinness World Records as the biggest simulated pool.