	There is evidence that human habitation in the Arabian Peninsula dates back to about 125,000 years ago. A 2011 study found that the first modern humans to spread east across Asia left Africa about 75,000 years ago across the Bab-el-Mandeb connecting the Horn of Africa and Arabia. The Arabian peninsula is regarded as a central figure in the understanding of hominin evolution and dispersals. Arabia underwent an extreme environmental fluctuation in the Quaternary that led to profound evolutionary and demographic changes. Arabia has a rich Lower Paleolithic record, and the quantity of Oldowan-like sites in the region indicate a significant role that Arabia had played in the early hominin colonization of Eurasia.