Western Mallee

Western Mallee is an Interim Biogeographic Regionalisation for Australia (IBRA) subregion in southern Western Australia. It is a sparsely populated subregion with an area of about 47,000 square kilometres, roughly centred on the town of Newdegate. Largely cleared for intensive agriculture, it still retains patches of native vegetation, but these are under environmental stress from threats such as rising salinity, and are poorly managed.

Western Mallee is roughly defined as the western half of the Mallee biogeographic region. It has an area of 47,636 square kilometres, which is only lightly populated. The main towns are Hyden, Gnowangerup and Lake Grace; lesser towns include Kulin, Ongerup, Duggan, Newdegate, Lake King and Kondinin.

The subregion contains a number of ecologically important freshwater wetlands, including the Lake Bryde-East Lake Bryde wetlands, a DIWA Wetland of National Significance and habitat for a critically endangered threatened ecological community of shrub lake beds; the Lake Grace system of wetlands, also a DIWA Wetland of National Significance; and the Lake Cronin system.

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