Highlights: The Sumida Aquarium is located on the 5th and 6th floors of the Tokyo Skytree. This urban aquarium has more than 10,000 species of marine life. The museum reproduces the "Tokyo Great Water Tank" in the Ogasawara Sea, a World Heritage Site, and an open indoor water tank. You can see penguins and fur seals, the aquarium also has a jellyfish tank and a research laboratory. The Cradle of Life takes the sea of the "Tokyo Islands" as its theme, and reproduces the "Tokyo Grand Tank". Watching whale sharks and various fish swimming in the water, it seems that the marine world of the Ogasawara Islands is in front of you. Playing with Water and Life This is the largest open indoor water tank in Japan, with a water volume of about 350 tons. There are penguins and fur seals living in a large water tank, and you can observe them up close. The exhibition space is connected through two floors, shortening the distance between tourists and animals, and using LED lighting, you can not only watch them move during the day, but also observe penguins sleeping at night. Aquarium Restaurant There is a penguin cafe in the aquarium, providing snacks, desserts, soft drinks, and a place for tourists to rest.