The Marmion Marine Park is a protected area along and off the coast of northern Perth

Perth, Western Australia

Perth is the capital and largest city of the Australian state of Western Australia and the fourth most populous city in Australia. The Perth metropolitan area has an estimated population of almost 1,700,000....

, Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

.

In 1987, this park was declared the first marine park in Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

. The park covers an area of 10,500 ha, from Trigg Island

Trigg, Western Australia

Trigg is a suburb of Perth, Western Australia. Its Local Government Area is the City of Stirling. Trigg is also the name of a small island off the coast of the suburb of Trigg....

 in the south to Burns Beach

Burns Beach, Western Australia

Burns Beach is a suburb of Perth, Western Australia, located north of Perth's central business district at the northern fringe of the City of Joondalup...

 in the north.

Limestone

Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....

 reefs run parallel to the coastline and contain underwater limestone platforms and caves that hide many species of tropical fish.

Several other animals visit this area regularly, including the Australian Sea Lion

Australian Sea Lion

The Australian Sea Lion , also known as the Australian Sea-lion or Australian Sealion, is a species of sea lion that breeds only on the south and west coasts of Australia...

 and the Bottlenose Dolphin

Bottlenose Dolphin

Bottlenose dolphins, the genus Tursiops, are the most common and well-known members of the family Delphinidae, the family of oceanic dolphins. Recent molecular studies show the genus contains two species, the common bottlenose dolphin and the Indo-Pacific bottlenose dolphin , instead of one...

. Humpback Whales frequent the waters in May on their journey north. When they return between September and November, they are in breeding, making them easier to see by tourists.