Set on 6.2 acres of land at Pantai Chenang, Underwater World is one of the largest marine and freshwater aquaria in the region. It features over 5,000 varieties of fish and other exhibits from 500 species displayed in over 100 tanks. Highlights include the gigantic hexagonal tank and walk-through tunnel tank containing six million litres of sea water. Here you can observe sharks, stingrays, huge turtles and other sea creatures swim by, separated from the visitor only by the laminated clear glass walls of the tunnel. In 2005, the new RM30 million 60,000 sq ft  new wing to house  20 rockhoppers and 12 blackfooted penguins was opened to the public. The extension allows visitors to observe the animals from close range.The rockhopper penguins are placed in a tank containing rocks and water with the temperature maintained at eight degree Celsius while the blackfooted penguins are allowed to swim freely in a 20 degree Celsius tank. The 50 blackfooted penguins were brought in from South America. Seals are also housed here. With the addition of the new wing the Langkawi Underwater World now houses animals from three ecosystems - tropical, temperate and cold. Also on display at the new wing is the anaconda from the Amazon, the arapaima - world's largest freshwater fish, the capybara - world's largest rodent and the marmoset - world's smallest monkey.The Underwater World also has a 3-D cinema with a capacity of 200 visitors at any one time.The cinema uses virtual reality technology to portray large and small sea creatures.Many of these creatures are not able to live and exist in aquariums. The system enables visitors to view these creatures up close and in as real a situation as possible.