IBRA was published in the 1990s, Beard's regionalisation was used as the baseline for Western Australia. The Warren region was accepted as defined by Beard, but reverted to the name "Warren". It has since survived a number of revisions. When the IBRA subregions were introduced in IBRA Version 6.1, the whole of Warren was defined as a single subregion. Under the World Wildlife Fund's biogeographic regionalisation of the world's terrestrial surface into "ecoregions", the Warren region is equivalent to the Jarrah-Karri forest and shrublands ecoregion of the Mediterranean forests, woodlands, and scrub biome. References Further reading Thackway, R and I D Cresswell (1995) An interim biogeographic regionalisation for Australia : a framework for setting priorities in the National Reserves System Cooperative Program Version 4.0 Canberra : Australian Nature Conservation Agency, Reserve Systems Unit, 1995. Forests of Western Australia IBRA regions Mediterranean forests, woodlands, and scrub in Australia Southwest Australia Ecoregions of Western Australia