The Determination Area covers about 28,800 square kilometres of Malgana traditional country and encompasses: much of the UNESCO World Heritage Listed (1991) Area of Shark Bay and the Shark Bay Marine Park, Dirk Hartog Island National Park, Edel Land Peninsula and Steep Point – the most westerly point on Mainland Australia, the township of Denham and the whole of the Peron Peninsula and number of pastoral leases.

All Malgana Country and waters are important to the Malgana people. Some areas of particular cultural, historical and environmental significance within the Determination Area include Dirk Hartog Island, Carrarang, Hamelin homestead, Carrarang station, Denham townsite (previously called Freshwater Camp), Faure Island, Peron and Magpie.

The Determination Area is home to places of special spiritual significance to the Malgana people, in particular the burial places of the old people, whose spirits still inhabit Malgana country today.