Looks like they've got it down to Tanzinia and Ethiopia.
I love this stuff. I love trying to explain this to racists and watching their faces go through the colours of the rainbow
"New DNA evidence suggests "African Eve", the 150,000-year-old female ancestor of every person on Earth, may have lived in Tanzania or Ethiopia.
A genetic study has shown that the oldest known human DNA lineages are those of East Africans. The most ancient populations include the Sandawe,
Burunge, Gorowaa and Datog people who live in Tanzania."