[3] Located in inland New South Wales and Queensland, these are flat plains with some low hills and infertile sandy soil with a cover of grasses and shrubs with mulga and eucalyptus trees.

Mulga trees are a type of acacia which have adapted to efficiently collect the sparse rainfall, are the distinctive habitat of this ecoregion while the ground cover consists of shrubs and grasses.

This part of Australia is generally dry and when flooded Lakes Wyara and Numalla are important habitats for birds, being home to 250,000 birds of 40 species including the rainbow bee-eater, Australasian shoveller, freckled duck, musk duck, black swan, silver gull, Australian pelican, great egret, and glossy ibis.

However, most of the area is used for grazing sheep and cattle, so there is always a danger of overgrazing while mulga leaves are used as livestock fodder and other trees are removed to create more grassland and to allow access to water sources.

Others include Hell Hole Gorge, Lake Bindegolly, Mariala, Thrushton, part of Welford, Idalia and the Culgoa Floodplain National Parks.