Bernier Island is one of three islands that comprise the Bernier and Dorre Island Nature Reserve in the Shark Bay World Heritage area

Shark Bay, Western Australia

Shark Bay is a World Heritage Site in the Gascoyne region of Western Australia. It is an area centred approximately on , 800 kilometres north of Perth, on the westernmost point of Australia. An expedition led by Dirk Hartog happened upon the area in 1616, becoming the second group of Europeans...

 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...

.

It was a hospital location in the early 1900s.

It is located at the north-western corner of the World Heritage area, almost due west of Carnarvon, Western Australia

Carnarvon, Western Australia

Carnarvon is a coastal town situated approximately 900 kilometres north of Perth, Western Australia. It lies at the mouth of the Gascoyne River on the Indian Ocean. The popular Shark Bay world heritage area lies to the south of the town and the Ningaloo Reef lies to the north...

. The 2.6 ha Koks Island is offshore from the lighthouse at its northern end. It is separated from Dorre Island

Dorre Island

Dorre Island is one of three islands that make up the Bernier and Dorre Island Nature Reserve in the Shark Bay World Heritage area in Western Australia...

 to its south by a 0.5 km gap with a depth of 4 m.

The island is home to one of the few remaining colonies of the Banded Hare-wallaby (Lagostrophus fasciatus).