Boullanger Island lies off the coast of Western Australia and covers an area of about 35 hectares (86 acres).

It is located within the Jurien Bay Marine Park and part of the Boullanger, Whitlock, Favourite, Tern and Osprey Islands Nature Reserve.

The Park protects an important section of Western Australia's central west coast, including Boullanger, Whitlock and Escape islands.

Both Boullanger Island and Jurien Bay were named on 1 July 1801 by the French expedition led by Captain Nicolas Baudin aboard the Géographe.

[3][4] It was formerly considered a subspecies of the grey-bellied dunnart (S. griseoventer), for which reason it was not assessed by the IUCN in 2008 (although it was classed as critically endangered in the 1996 list).