The east coast has a mountain range (well….’mountain’ by Australian standards) running along it. This results in the east coast being relatively well watered and climatically temperate. It’s much more suited for growing crops and just living comfort generally.
The west coast, outside of the extreme south-west around Perth, is mostly arid or semi-arid. While the northern parts are tropical, it’s a ‘savannah’ type tropical climate, where it’s arid for 8 months a year and torrential monsoon for the other 4. Not really an environment for long-term sustainability of a large population.
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