Rottnest Island is an island off the coast of Western Australia, located 18 kilometres west of Fremantle. A sandy, low-lying island formed on a base of limestone, Rottnest is an A-class reserve which is the highest level of protection afforded to public land. It is often regarded as the most beautiful island in Western Australia. The island is a popular holiday destination, and there are daily ferry services to Perth.

Rottnest is perhaps best known for its population of quokkas, a small native marsupial found in very few other locations. The island also includes colonies of Australia sea lions and southern fur seals.