The Mary Anne Group is an archipelago

Archipelago

An archipelago , sometimes called an island group, is a chain or cluster of islands. The word archipelago is derived from the Greek ἄρχι- – arkhi- and πέλαγος – pélagos through the Italian arcipelago...

 off the north west coast of 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...

, nominally located at 21º17'S 115º30'E. Together with the Mangrove Islands and Passage Islands, it is part of a long chain of near-shore islands stretching from the vicinity of Onslow

Onslow, Western Australia

Onslow is a coastal town in the Pilbara region of Western Australia, north of Perth. It currently has a population of around 573 people and is in the Shire of Ashburton Local Government Area....

 to the mouth of the Fortescue River

Fortescue River

The Fortescue River is an ephemeral river in the Pilbara region of Western Australia. It is the third longest river in the state.The river rises near Deadman Hill in the Ophthalmia Range about 30 km South of Newman. The river flows in a Northerly direction parallel with the Great Northern...

.

It is presumably named after the Mary Anne, which was shipwreck

Shipwreck

A shipwreck is what remains of a ship that has wrecked, either sunk or beached. Whatever the cause, a sunken ship or a wrecked ship is a physical example of the event: this explains why the two concepts are often overlapping in English....

ed in the area in 1870.