According to genetics our species was originated in Botswana

Mitochondrial DNA belonging to African nomads shows that modern humans live in lake Makgadikgadi 200.000 years ago. This conclusion is contrary to what the fossil evidence suggests, as the oldest human fossil remains have been found in Ethiopia and Morocco.

In this study the analysis was made using the biggest database of khoisán mitDNA. The khoisan are a nomad tribe that have a life based on hunting and gathering. This database was conformed by the mitDNA of 1.217 individuals. Also, the research team reconstructed the clima in that are for the las 250.000 years. According to the results, the actual desertic area was a wetland back then. This wetland could sustain humans for 70.000 years and then, 110.000 years ago, the first migration occured. However, this migration to the Southeast of Africa was not successful.

Even though it cannot be discarded that Homo sapiens have multiple origins the authors of this study support that the human species originated in the Makgadilgadi wetland.

Map of southern Africa between 2,300 and 1,500 ya. Khoesan remains provide evidence for indigenous inhabitance across the entire region south of the Zambezi River (white). (Hayes, V. M., 2014)

Source of the article: https://elpais.com/elpais/2019/10/28/ciencia/1572268579_834668.html

Original article: Morris, A. G., Heinze, A., Chan, E. K. F., Smith, A. B., & Hayes, V. M. (2014). First Ancient Mitochondrial Human Genome from a Prepastoralist Southern African. Genome Biology and Evolution, 6(10), 2647–2653. doi:10.1093/gbe/evu202