Erosion of the Eucla Basin's limestone by rainwater and groundwater has created a karst landscape, with extensive underground sinkholes and caverns.

[2] The plant communities of the bioregion include mallee woodlands and shrublands on scree slopes, limestone pavements, and dunes.

They are characterised by mallee, shrubs or trees, generally eucalypts, with multiple stems rising from an underground woody base called a lignotuber.

[4] Threats to the bioregion include overgrazing by sheep, invasive animals like foxes, wild dogs, feral cats, starlings, camels, horses and rabbits, and invasive plants like Ward's weed (Carrichtera annua) and sea spurge (Euphorbia paralias).

[2] The Eyre Bird Observatory is located in coastal mallee woodland in Nuytsland Nature Reserve.