Western Australia can be divided on the geological classification into eleven regions: Perth and Fremantle, Peel (Western Australia), South West, Great Southern, Esperance, Goldfields, Heartlands, Mid West, Gascoyne-Outback Coast, Pilbara and Kimberley. The total land area of Western Australia is 2.52988 million km ² and is seven times as large as Germany.
Australia ya Magharibi unaweza kugawanywa katika uainishaji kijiolojia katika mikoa kumi na moja: Perth na Fremantle, Peel (Australia ya Magharibi), Kusini Magharibi, Kusini mwa Mkuu, Esperance, Goldfields, Heartlands, Mid West, Gascoyne-Outback Coast, Pilbara na Kimberley. ardhi ya Australia Magharibi ni 2,529,880 km ² na ni mara saba kubwa kama Ujerumani.