Spanning nearly six acres, Underwater World is one of the most famous attractions on the island of Langkawi. At the southern end of Pantai Cenang next to the Zone Duty-Free Shopping Center, this is the largest aquarium in Malaysia. The white-washed giant formation houses more than 200 different species of marine and freshwater fish, including harbour seals, rockhopper penguins, sharks, giant rays and the giant Amazonian arapaima – the world's largest freshwater fish. Once you enter the A/C interior, Araipamas (the world's largest freshwater fish) can be seen in a medium-sized tank in front of the entrance. The complex is divided into three sections: tropical rainforest, temperate and sub-Antarctic. The sub-Antarctic was probably the most popular section - the 'Penguin-Arium' features cute little rockhoppers and black-footed penguins, which cause enough people to crowd around the exhibit to get a good look. Other highlights of the tourist-friendly Underwater World include an educational resource centre, a cafeteria, and a three-dimensional (3D) theatre – a short film about Michael, a small prehistoric fish and looking at his life before it became a fossil. Make sure. At the end is a huge walk-through six million litre underwater tunnel tank that houses a large number of fish including sharks, giant stingrays and green turtles.