Underwater World Langkawi is one of the largest marine and fresh water aquariums in South East Asia. Unique to Underwater World is their gigantic 15-meter long walk-through tunnel with 500,000 liters of seawater and many large fish and other sea creatures for you to explore. It is located next to a shopping centre and the Neptune Café providing visitors with one-stop shopping, eating and entertainment. Admission: Adults - RM38 Children - RM28