- Scientists have identified the most likely route Aboriginal people took to get to Australia tens of thousands of years ago.
- The research is the earliest, indirect evidence for sea faring by humans anywhere in the world.
- The findings challenge a theory that these early adventurers travelled from Southeast Asia.
Australian researchers have identified the most likely route the ancestors of Aboriginal people took to get to Australia for the first time tens of thousands of years ago.
Co-lead researcher Shimona Kealy, from the ANU, says these people probably travelled through Indonesia’s northern islands, into New Guinea and then Australia.
All three were part of a single continent between 50,000 and 70,000 years ago, when sea levels were 25 to 50 metres below the current level.
The findings challenge a theory that these early adventurers travelled from Southeast Asia, through Indonesia and Timor and then across sea to reach Australia’s shores and land that is part of the Northern Territory today.
“We’ve created a treasure map of sorts with the likely route across land and water that these incredible people took to reach Australia,” says Kealy, a PhD scholar at the School of Culture, History and Language and an Associate Investigator at the ARC Centre of Excellence for Australian Biodiversity and Heritage at ANU.
“We’ve circled all of the islands that we want to explore further to find archaeological evidence to test if this is in fact the path that they took.
“Archaeologists have yet to explore most of Indonesia’s northern islands for human settlements predating the oldest sites found in Australia. These islands could hold the key to the mystery of how the first humans made it to Australia’s shores.”
The study modelled the least-cost path from Southeast Asia to Australia, by considering factors such as difficulty to travel up slopes, visibility at sea, access to fresh water along the many potential pathways and the sophistication of maritime technology at the time.
Kealy says the oldest dates for human occupation on the Australian-New Guinea continent, known as Sahul, represent the earliest, indirect evidence for sea faring by humans anywhere in the world.
“This study helps to tell the Australian story, particularly for Indigenous people, and acknowledges the bravery, innovation and maritime technologies and skills of these early modern humans,” she says.
The islands directly north and west of Sahul (known as Wallacea) were never connected to the mainland, requiring multiple successful water crossings east from mainland Southeast Asia.
“These people hopped their way along these islands, probably looking for a place to live where they would have access to reliable food staples and other resources — the visibility between islands would have been very favourable in terms of enabling this adventurous spirit,” says Kealy.
Co-lead researcher Professor Sue O’Connor from ANU says the alternative route through Timor onto the northwest coast of Australia is now seen as less likely as a result of this study’s least-cost pathway modelling.
“The suggested route through Timor is also considered less likely given comprehensive archaeological evidence indicates the earliest human settlements in Timor are much younger than those found in Madjedbebe in Arnhem Land in the Northern Territory,” says Professor O’Connor.
The study is published in the Journal of Human Evolution.
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