Castaway Bay, Themed precinct in Sea World, Gold Coast, Australia.

Castaway Bay is a themed precinct within Sea World where visitors encounter aerial rides, water play areas, and hands-on attractions designed throughout multiple zones. Each section caters to specific age groups, creating distinct entertainment spaces within the larger facility.

In December 2009 Sea World announced a multimillion-dollar water attraction for 2010, confirmed in May 2010 as a A$6 million interactive adventure zone. A month later the park named its three parts: Battle Sails, Sky Climb and Sky Fortress. Battle Sails became Battle Boats before the opening on 18 September 2010. The Reef splash zone followed in December 2017.

Castaway Bay's shipwreck theme runs through Battle Boats, whose eight boats pass up to 80 water guns mounted around the course. The area's attractions were supplied by Mack Rides and Prime Interactives, with theming by Sculpt Studios. The Reef, added in December 2017, has over 80 water cannons, spouts and interactive character sculptures.

The Reef sits at ground level with no pools, so it is fully wheelchair accessible and disability friendly. Battle Boats riders under 120 cm must be accompanied by an adult aged 14 or over. Sky Climb participants must be at least 120 cm tall and weigh under 130 kg, with under-140 cm guests accompanied by an adult.

The Reef, added in December 2017, sits at ground level with no pools, so it is fully wheelchair accessible. It has over 80 water cannons, spouts and interactive character sculptures, and its attractions were built by Mack Rides and Prime Interactives with theming by Sculpt Studios.