Spread across nearly six acres, Underwater World Langkawi is one of the island’s best-known attractions. Located at the southern end of Pantai Cenang (almost at the border of Pantai Tengah), beside the Zon duty-free shopping centre, it is Malaysia’s largest aquarium. The huge white-washed structure houses more than 200 different species of marine and freshwater fish including harbour seals, rockhopper penguins, sharks, giant rays and the enormous Amazonian arapaima – the biggest freshwater fish in the world.