Seagaia Ocean Dome

The Seagaia Ocean Dome was one of the world’s largest Polynesia-themed indoor waterparks, located in Miyazaki, Miyazaki, Japan. The Ocean Dome measured 300-meters in length and 100-meters in width, and featured a retractable roof, fire-spitting volcano, artificial sand, palm trees, and the world’s largest indoor wave pool. No matter the season, its sky was always blue, while the air temperature was locked in at 86° F, with the water at 82° F. Continue reading for two more videos and additional information.

It opened in 1993, and visitor numbers peaked in 1995 at 1.25 million a year. Depending on the season, entrance cost was Y2600 per adult and Y1600 for children (roughly 30 and 20 USD in 1995 respectively). The Ocean Dome was officially closed on October 1, 2007 as part of a renovation and partial re-branding of the resort. The roof of the structure was retractable in four sections.