The Twelve Apostles are a collection of limestone stacks off the shore of Port Campbell National Park, by the Great Ocean Road in Victoria, Australia.

Six of them are visible from the most popular viewpoint, while the seventh is located several metres away from the corner of the main viewing platform.

The harsh and extreme weather conditions from the Southern Ocean gradually erode the soft limestone to form caves in the cliffs, which then become arches that eventually collapse, leaving rock stacks up to 50 m (160 ft) high.

Due to wave action eroding the cliffs, existing headlands are expected to become new limestone stacks in the future.

[9] In March 2023, the Federal Court of Australia ruled in favour (under the Native Title Act of 1993) of formally recognising the Eastern Maar people as traditional owners' of 8,578 km2 of land located in south-west Victoria, including the Twelve Apostles.