Oldupai Gorge

We then proceeded to Oldupai Gorge, a canyon northwest of Ngorongoro Crater that is approximately 50 kilometers wide and 90 meters deep.
Because of a unique geological history that placed distinct layers of volcanic deposits in the area over a period of almost two million years, the gorge has provided tremendous insight into ancient life. The fossils excavated from Oldupai Gorge provide some of the oldest evidence of human existence. A set of 3.6 million-year-old footprints were found near the gorge that were made by three early hominids. The most famous fossil from the gorge is a 1.8 million-year-old skull known as Australopithecus boisei, which is on display in a small museum.
The gorge also provides one of the best views of Oldoinyo Lengai, Tanzania’s only remaining active volcano. In the left of the picture below, you can see smoke rising from the volcano.