The African Rift Valley is a geographical feature extending for more than 5,000 km from northern Syria to Mozambique.
Between 1930 and 1938 Fuchs made a series of expeditions to explore some of the Rift Valley's lakes, and to investigate the geology of the landscape around them.
In 1931 Fuchs joined Louis Leakey's Expedition to Olduvai Gorge in the Eastern Serengeti. Rapidly eroding highlands around the ravine make this a good location for the preservation of mammal remains, including hominids. Today Olduvai is known as one of the best locations in the Rift Valley for anthropological research.