Kaiyukan is an aquarium located in Osaka, Japan. It is one of the largest aquariums in the world, featuring a diverse range of marine life. The facility showcases various habitats, including the Pacific Ocean, and is home to over 15,000 animals from 620 species. Visitors can explore multiple exhibits, including a massive central tank that houses a whale shark, the largest fish in the ocean. The aquarium emphasizes conservation and education, providing insights into marine ecosystems and the importance of protecting ocean life.