Joetsu Aquarium Umigatari is an aquarium in Niigata Prefecture. Among the many aquariums in Japan, this one is special for its focus on fish and sea animals from the Sea of Japan. The Sea of Japan is the ocean to the west of Japan's main peninsula and the one that Niigata borders on. In addition to allowing you to experience the local sea life from up close, the aquarium also offers a dolphin show against the picturesque backdrop of the ocean in the background.