The sun rises behind a Baobab tree in northern Botswana. Researchers say they have traced the origin of modern humans back to an area in Botswana south of the Zambesi River. [File: Mike Hutchings/Reuters]

Scientists claim they have traced the homeland for all modern humans to a region of northern Botswana, south of the Zambesi River. 

The area is now salt pans, but 200,000 years ago it was home to Homo Sapiens and hosted a population of modern humans for at least 70,000 years, according to a  study released in the scientific journal Nature on Monday.

The group remained in the region until regional climate changes led them to migrate, roughly 130,000 years ago, first to the northeast then to the southwest.

“We’ve known for a

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