fyi
From the comments:
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Hi AC
If you look at the sea level depth between the top of Australia and PNG you will see that there was a land
bridge between the two and that this was open until about 18,000 years back when the great melt started after
the ice age.
During the period in which water was tied up in massive ice fields the oceans were up to 130 metres lower than now.
Oceans reached a temporary high about 7,000 years back at the peak of the melt.
KK
Thanks very much for the ping to this interesting article!