Explore the underwater world, home to more than 30,000 marine lives in 400 species, at Siam Ocean World, one of Southeast Asia’s largest aquarium located right in the heart of Bangkok. The highlights include an underwater tunnel offering 270-degree views of an oceanarium, a 10.5-meter-wide fish tank offering 360-degree views of the ocean-like ecosystem and an eight-meter-tall tank displaying colorful coral while marine animals to watch are such as penguins, blue ring octopus, gray nurse sharks, elephant nose sharks, leafy sea dragons and giant spider crabs.