Cairns Aquarium, Public aquarium in Cairns, Australia.

Cairns Aquarium is a three-level, 7,800 m² facility in central Cairns holding 71 tanks, including a 1,800,000 L ocean tank, Australia's largest freshwater tank at 400,000 L, a deep reef tank and the world's first true tidal motion tank. Its ten ecosystems range from Rivers and Streams and a billabong amphitheatre to Rainforest, Mangroves, the Great Barrier Reef, Coral Sea Oceanarium and Deep Sea.

The aquarium opened in 2017 and quickly became an important attraction in Cairns. It received a major award shortly after opening for its building design and construction quality.

The place teaches visitors about the relationship between the Daintree Rainforest and the Great Barrier Reef through hands-on displays and live presentations. These exhibits show how land and sea ecosystems connect in this region.

The building is located in central Cairns on Florence Street and is easy to reach on foot. If you want a guided tour, arrive early as these last about two hours and spaces can fill up.

The 1,800,000-litre Coral Sea Oceanarium is the aquarium's largest tank, and the separate Billabong Amphitheatre holds 400,000 litres, described as Australia's largest freshwater aquarium. Since Reef HQ closed, this is the only aquarium worldwide exhibiting captive-bred olive sea snakes. The 2018 Master Builder Queensland awards named it Project of the Year and best Leisure Facility over $10 million.