What sea turtles live only off the coest of astraliua?

There is no sea turtle species that lives *exclusively* off the coast of Australia. However, Australia is home to a diverse range of sea turtle species, including:

* Green Sea Turtle (Chelonia mydas): Found in all Australian waters, including the Great Barrier Reef.

* Loggerhead Sea Turtle (Caretta caretta): Found in all Australian waters, including the Great Barrier Reef.

* Hawksbill Sea Turtle (Eretmochelys imbricata): Found in tropical and subtropical waters around Australia, including the Great Barrier Reef.

* Flatback Sea Turtle (Natator depressus): Found only in Australian waters, from the west coast to Queensland.

* Leatherback Sea Turtle (Dermochelys coriacea): Found in all Australian waters, particularly along the east coast and around Tasmania.

It's important to note that while some species like the Flatback Sea Turtle are primarily found in Australia, they may occasionally be seen in neighboring regions. Sea turtles are migratory and their ranges can vary depending on the season and other factors.