What continent did the Australian aborigines come from?

This is interesting. From Wiki :

Indigenous Australians are the Aboriginal and Torres Strait Islander people of Australia, descended from groups that existed in Australia and surrounding islands prior to European colonisation. The earliest definite human remains found in Australia are those of Mungo Man, which have been dated at about 40,000 years old,^[2] although the time of arrival of the first Indigenous Australians is a matter of debate among researchers, with estimates dating back as far as 125,000 years.

Plus this.

Migration to Australia - Genographic Project - National Geographic

Dear Corley and Rooster,

On that website you listed RC, was this proposed migration route for humans out of Africa and dispersing the whole world - especially interesting, I thought!

https://genographic.nationalgeographic.com/human-journey/

It speculates that Australian aborigines and Native Americans shared common ancestors, whereas another place Corley found suggests that Australians were direct ancestors for at least some Native Americans.

But, another video Corley found this morning says there is no way aborigines could have come from Australia, across the Pacific, to the New World...

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Well Rooster, I really like the speculation on your link that aborigines could have been in Australia for 125,000 years. It is clear this field of understanding human dispersal is just beginning...and SO fascinating...

Just a couple of points to add to the excellent information already given.

As far as I know (and this is "knowledge" gleaned over the years rather than absolute fact) the aborigines have been in Australia for at least 40,000 years. I've never heard the 125,000 year claim but couldn't rule it out.

Originating in Africa the aborigines made their way through Asia and across the land bridge to Oz -- a bridge which now remains only in the form of a string of archipelagos, of which Indonesia is the most prominent.

I really don't see the Australian aborigines being the direct forebears of the American tribes -- they are vastly different from each other -- although it's possible that they shared a common ancestor. If the information posted on this site last week is accurate it's more than likely that this was so.

There were two basic groups of aborigines. One group  settled in Tasmania (that's the island across Bass Strait, just south of Australia's east coast) and developed differently to those who settle the mainland where there were many tribes and groups.

The Tasmanian aborigines were wiped out during the first hundred years of European colonisation and Truganini, the last surviving Tasmanian, died in 1876. Our treatment of the aborigines brings no credit to our settlers and, even today, governments (and ordinary people) are struggling to find an equitable balance between the two cultures.

The Torres Strait islanders are another group who also developed differently to both the Australians and the Tasmanians. (Torres Strait lies to Australia's north, between Cape York and Papua-New Guinea.)