International Associated acts Ecoregions in Australia are geographically distinct plant and animal communities, defined by the World Wide Fund for Nature based on geology, soils, climate, and predominant vegetation.
The WWF ecoregions are classified by biome type (tropical and subtropical moist broadleaf forests, temperate grasslands, savannas, and shrublands, tundra, etc.
Australia, together with New Zealand, New Guinea and neighboring island groups, is part of the Australasian realm.
Like the IBRA, it was developed for use as a planning tool for conservation science, with the goal of establishing a system of nature reserves in each of the ecoregions or bioregions sufficient to preserve biodiversity.
The freshwater fish provinces "were derived through similarity analyses, parsimony analysis, and drainage-based plots of species ranges".