To the east of this sweeping valley, visitors can climb the snow-cloaked equatorial peaks of Mount Kenya and fish for trout in crystal clear streams.Hell's Gate National Park harbors obsidian caves and hisses with natural geysers and hot springs.
Samples from the megadrought times had little pollen or charcoal, suggesting sparse vegetation with little to burn.
Such crossing became possible when sea level had fallen by more than 80 meters to expose much of the shelf between southern Eritrea and Yemen; a level that was reached during a glacial stadial from 60 to 70 ka as climate cooled erratically to reach the last glacial maximum.
From 135,000 to 90,000 years ago, tropical Africa had megadroughts which drove the humans from the land and towards the sea shores, and forced them to cross over to other continents.
In Oman, a site was discovered in 2011 containing more than 100 surface scatters of stone tools belonging to a regionally-specific lithic industry, the late Nubian Complex, known previously only from Northeast Africa.
Two optically stimulated luminescence age estimates place the Arabian Nubian Complex at approximately 106,000 years old.
The area around Lake Malawi, today heavily forested, was a desert approximately 135,000 to 90,000 years ago.