Archeological evidence indicates that the ancestors of today's Aboriginal Australians first migrated to the continent 50,000 to 65,000 years ago. While there have been genomic studies placing arrival as late as 43,000 years ago, a 2025 study suggests that the peopling of Australia happened around 60,000 years ago, via two distinct routes.
Early human migration to Australia was achieved when it formed a part of the
Sahul continent, connected to the island of New Guinea via a
land bridge. This would have nevertheless required crossing the sea at the
Wallace Line. It is also possible that people came by island-hopping via an island chain between
Sulawesi and New Guinea, reaching North Western Australia via
Timor. As sea levels rose, the people on the
Australian mainland and nearby islands became increasingly isolated, some on Tasmania and some of the smaller offshore islands when the land was inundated at the start of the
Holocene, the
inter-glacial period that started about 11,700 years ago. A 2021 study by researchers at the
Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage has mapped the likely migration routes of the peoples as they moved across the
Australian continent to its southern reaches of what is now
Tasmania (then part of the mainland). The modelling is based on data from
archaeologists,
anthropologists,
ecologists,
geneticists,
climatologists,
geomorphologists, and
hydrologists. The new models suggest that the first people may have landed in the
Kimberley region in what is now
Western Australia about 60,000 years ago, and had settled across the continent within 6,000 years. Aboriginal Australians may have one of the oldest continuous cultures on earth. In
Arnhem Land in the
Northern Territory, oral histories comprising complex narratives have been passed down by
Yolngu people through hundreds of generations. The
Aboriginal rock art, dated by modern techniques, shows that their culture has continued from ancient times.
Genetics {{multiple image Genetic studies have revealed that a population wave, termed
East Eurasian Core, outgoing from the
Iranian plateau during the
Initial Upper Paleolithic period populated the Asia-Pacific region via a
southern route dispersal. This wave is suggested to have expanded into the
South and
Southeast Asia region and subsequently diverged rapidly into the ancestors of
Iranian Hunter Gatherers (IHG),
Ancient Ancestral South Indians (AASI),
Andamanese,
East Asians, and Australasians, including Aboriginal Australians and
Papuans. Mallick et al. 2016 and Mark Lipson et al. 2017 found the bifurcation of Eastern Eurasians and Western Eurasians dates to at least 45,000 years ago, with indigenous Australians nested inside the Eastern Eurasian clade. or alternatively are nested within the Eastern Eurasian cluster without a strong internal cladal structure against mainland Asian lineages.
Other studies In a 2001 study, blood samples were collected from some
Warlpiri people in the
Northern Territory to study their genetic makeup (which is not representative of all Aboriginal peoples in Australia). The study concluded that the Warlpiri are descended from ancient Asians whose DNA is still somewhat present in Southeastern Asian groups, although greatly diminished. The Warlpiri DNA lacks certain information found in modern Asian genomes, and carries information not found in other genomes. This reinforces the idea of ancient Aboriginal isolation. Genetic data extracted in 2011 by Morten Rasmussen et al., who took a
DNA sample from an early-20th-century lock of an Aboriginal person's hair, found that the Aboriginal ancestors probably migrated through
South Asia and
Maritime Southeast Asia, into Australia, where they stayed. As a result, outside of Africa, the Aboriginal peoples have continuously occupied the same territory longer than any other human populations. These findings suggest that modern Aboriginal Australians are the direct descendants of the eastern wave, who left Africa up to 75,000 years ago. The Rasmussen study also found evidence that Aboriginal peoples carry some genes associated with the
Denisovans (a species of human related to but distinct from
Neanderthals) of Asia; the study suggests that there is an increase in
allele sharing between the Denisovan and Aboriginal Australian genomes, compared to other Eurasians or Africans. Examining DNA from a finger bone excavated in
Siberia, researchers concluded that the Denisovans migrated from
Siberia to tropical parts of Asia and that they interbred with modern humans in Southeast Asia 44,000 years BP, before Australia separated from New Guinea approximately 11,700 years BP. They contributed DNA to Aboriginal Australians and to present-day New Guineans and an indigenous tribe in the Philippines known as
Mamanwa. This study confirms Aboriginal Australians as one of the oldest living populations in the world. They are possibly the oldest outside Africa, and they may have the oldest continuous culture on the planet. A 2016 study at the
University of Cambridge suggests that it was about 50,000 years ago that these peoples reached
Sahul (the
supercontinent consisting of present-day Australia and its islands and
New Guinea). The sea levels rose and isolated Australia about 10,000 years ago, but Aboriginal Australians and Papuans diverged from each other earlier, genetically, about 37,000 years BP, possibly because the remaining land bridge was impassable. This isolation makes the Aboriginal people the world's oldest culture. The study also found evidence of an unknown
hominin group, distantly related to Denisovans, with whom the Aboriginal and Papuan ancestors must have interbred, leaving a trace of about 4% in most Aboriginal Australians' genome. There is, however, increased genetic diversity among Aboriginal Australians based on geographical distribution. Carlhoff et al. 2021 analysed a
Holocene hunter-gatherer sample ("Leang Panninge") from
South Sulawesi, which shares high amounts of genetic drift with Aboriginal Australians and Papuans. This suggests that a population split from the common ancestor of Aboriginal Australians and Papuans. The sample also shows genetic affinity with East Asians and the Andamanese people of South Asia. The authors note that this hunter-gatherer sample can be modelled with ~50% Australian/Papuan-related ancestry and either with ~50% East Asian or Andamanese Onge ancestry, highlighting the deep split between Leang Panninge and Aboriginal/Papuans. Two genetic studies by Larena et al. 2021 found that
Philippines Negrito people split from the common ancestor of Aboriginal Australians and Papuans before the latter two diverged from each other, but after their common ancestor diverged from the ancestor of
East Asian peoples. Like Papuans, it's believed that Aboriginal Australians underwent a secondary admixture event with Altai-related Denisovan populations after they diverged from the ancestors of East Asians, who already mixed with Denisovans. This event was also separate from the admixture event experienced by Filipino
Negritos, explaining why Aboriginal Australians and Papuans have relatively lower Denisovan ancestry. Based on a reevaluation of mitogenomes, Gandini et al. 2025 proposed a "long chronology", which suggested an earlier settlement of Sahul by two migration routes about ~60 ka. One route came from northern Sunda via the
Philippine archipelago whilst the other came from southern Sunda via
Mainland Southeast Asia, with both routes ultimately tracing back to South Asia. The settlers that undertook these routes were ancestral to populations indigenous to Australia, New Guinea and Oceania, and were also related to other East Eurasians instead of belonging to a separate wave.
Changes about 4,000 years ago The
dingo reached Australia about 4,000 years ago. Near that time, there were changes in language (with the
Pama-Nyungan language family spreading over most of the mainland), and in
stone tool technology. Smaller tools were used. Human contact has thus been inferred, and genetic data of two kinds have been proposed to support a gene flow from India to Australia: first, signs of South Asian components in Aboriginal Australian genomes, reported on the basis of genome-wide
SNP data; and second, the existence of a
Y chromosome (male) lineage, designated
haplogroup C∗, with the most recent common ancestor about 5,000 years ago. The researchers had two theories for this: either some Indians had contact with people in Indonesia who eventually transferred those Indian genes to Aboriginal Australians, or a group of Indians migrated from India to Australia and intermingled with the locals directly. Bergstrom's 2018 doctoral thesis looking at the population of Sahul suggests that other than relatively recent admixture, the populations of the region appear to have been genetically independent from the rest of the world since their divergence about 50,000 years ago. He writes "There is no evidence for South Asian gene flow to Australia .... Despite Sahul being a single connected landmass until [8,000 years ago], different groups across Australia are nearly equally related to Papuans, and vice versa, and the two appear to have separated genetically already [about 30,000 years ago]."
Environmental adaptations foothills in an 1854 painting by Alexander Schramm Aboriginal Australians possess inherited abilities to adapt to a wide range of environmental temperatures in various ways. A study in 1958 comparing cold adaptation in the desert-dwelling
Pitjantjatjara people compared with a group of European people showed that the cooling adaptation of the Aboriginal group differed from that of the Europeans, and that they were able to sleep more soundly through a cold desert night. A 2014
Cambridge University study found that a beneficial mutation in two genes that regulate
thyroxine, a hormone involved in regulating body
metabolism, helps to regulate body temperature in response to fever. The effect of this is that the desert people are able to have a higher body temperature without accelerating the activity of the whole of the body, which can be especially detrimental in childhood diseases. This helps protect people to survive the side-effects of infection. ==Population history==