Kukushima Bay is in the south of Kujukushima. It is surrounded by a complex coastline and numerous islands. Reef, algae field, coast, beach and mud pool are scattered here, and the environment is rich in changes. Moreover, living creatures live in various environments. In Japan, it is also a rare open-air large trough in the Kujukushima Bay, which reproduces the changes of natural environment and organisms from the distant sea to the coast. It can be observed carefully in the circular corridor.