Eastern Mallee

Eastern Mallee is an Interim Biogeographic Regionalisation for Australia (IBRA) subregion in southern Western Australia.

Eastern Mallee is roughly defined as the eastern half of the Mallee biogeographic region. It has an area of around 46,000 square kilometres, and is very sparsely populated. The only towns occur along the road from Esperance to Norseman. The largest and best known town is Salmon Gums; others include Scaddan, Grass Patch, Red Lake and Dowak, Western Australia.

Watercourses in the area include Young River, Lort River, Oldfield River and Jerdacuttup River. Drainage is occluded, however, and the area has numerous salt pans.

Situated on the south-eastern edge of the Yilgarn Craton, Eastern Mallee has a gently undulating landscape. It has a variety of surface types, including calcareous clays and loams containing kankar; outcrops of metamorphosed sandstone; white and yellow sand; and loamy pan fields. Gypsum dunes also occur in the area.

Western Mallee is semi-arid, with a warm, dry, Mediterranean climate, and a winter rainfall of 300 and 500 millimetres (12–19 in).

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