Part of the Olduvai Gorge.
Olduvai Gorge definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A ravine in northern Tanzania west of Mount Kilimanjaro. It contains archaeological sites rich in fossils and Paleolithic implements.