Introduction to the National Aquarium: The National Aquarium is only 5 minutes away from the city center. The aquarium has both freshwater and saltwater fish tanks, and a sightseeing tunnel (River 1 and Tunnel) with a capacity of one million liters, which breeds a variety of Australian fish for viewing. In addition, there is a wildlife sanctuary within the aquarium, with koalas, kangaroos, little penguins and other wild animals.