It has within it, two sub-regions named after localities within the region:
- "Revision of the Interim Biogeographic Regionalisation for Australia (IBRA) and Development of Version 5.1 - Summary Report". Environment Australia. Department of the Environment and Water Resources, Australian Government. Archived from the original on 5 September 2006. Retrieved 31 January 2007.
- IBRA Version 6.1 data
- "Southwest Australia savanna". Terrestrial Ecoregions. World Wildlife Fund.
- 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. ISBN 0-642-21371-2