The Ketheres Aquarium (イエールのアクアリウム Iēru no Akuariumu?) is a massive aquarium on Ketheres. It is known for the Astro Ocean (アストロオーシャン Asutoro Ōshan?). The aquarium runs through a large part of Ketheres and is incorporated into the walls and floors of certain areas. The Astro Ocean is located in one of the high rises which projects from below Ketheres, providing an unparalleled view of the Earth. Numerous species of saltwater fish are housed in the aquarium, such as sunfish, various rays, and whale sharks. There are also mammals such as sea turtles and dolphins.