The Osaka Aquarium Kaiyukan (???Kaiy?kan?, known as the KAIYUKAN) is one of the largest public 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 5400 cubic metres of water, and a variety of fish including manta rays and a pair of ...