There used to be such seas...
It was this big...
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And then shrank to this...
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It was called the Eromanga Sea. It is also no coincidence the Great Artesian Basin is roughly in that position of the sea in the second picture.
In these lockdown times, try and track down Australia: The Time Traveller's Guide. It's a great insight into this ancient land's really ancient history. It's not in iView sadly, but is in iTunes, and you can purchase it on YT, $6/ep, or $22/full season (4 eps). I have also seen it in... other places.![]()
OK that sounds really interesting