Osaka Aquarium Kaiyukan is one of the largest aquariums in the world. It is located in the ward of Minato in Osaka, Japan, near Osaka Bay. The walk-through aquarium displays several habitats in 16 tanks, along with the marine life inside them. The habitats are from the Ring of Fire and the Ring of Life areas of the Pacific Ocean. The largest tank holds 5,400 cubic meters of water and houses three whale sharks.