Located within the Ocean Expo Park, the Okinawa Churaumi Aquarium is home to the world's second largest aquarium tank. Spread out over its four floors are 77 tanks with more than 26,000 marine animals. Look down into the large, open Coral Sea Tank on the fourth floor, and reach out to varieties of seashells at the Touch Pool on the third floor. The route through the aquarium then leads past the Kuroshio Tank, which lets you see whale sharks and manta rays through a large acrylic panel.