Sailing. The same way they jumped from the Horn of Africa to today’s Yemen: by building boats and sailing/rowing.
We have to remember the hunter-gatherer life included fishing. And those early humans, while traveling from the Middle East to SouthEast Asia, went along the coasts, preferring warm climates and island hopping. The fact that they still relied on stone tools and not metals yet doesn’t mean they weren’t sophisticated and organized.
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