Aquatopia is an attraction at Tokyo DisneySea.
Located in the Port Discovery area of the park, it is notable as being the second of only two attractions in the world (the other being Pooh's Hunny Hunt at neighboring park Tokyo Disneyland) to use a new trackless ride system designed by Walt Disney Imagineering.
It is considered to be the successor attraction to both Disneyland's Motor Boat Cruise and the Autopia, which in turn Aquatopia received its name as homage. The ride consists of around three dozen vehicles (designed to look like personal hovercrafts) which move independently from each other at quick speeds through a large water lagoon. The water in the lagoon is only around 5cm (2 inches) deep, as the vehicles actually roll along the shallow floor on wheels. The water is kept moving to create the illusion of depth, and occasional funnel drains give the appearance of foreboding whirlpools.
Like the older attractions it's inspired by, Aquatopia is self-guided. Due to the ride technology, there are no visible tracks, so the sensation of spontaneous and surprise in your path is unique with every ride, giving a repeatability (and dramatic visual kinetics) to the new attraction. There are two sides to the lagoon, which you board from a central boarding platform. In Summer, one side becomes a 'wet course' while the other is the 'dry course'. The 'wet course' adds the possibility of getting soaked by hidden water jets along the ride while the 'dry course' is jet free.