The Rift Valley is a geological relic of the critical weakening in the earth's crust along two roughly parallel faults which opened some 2 million years ago the world's largest geological divide.

The Ethiopian Rift Valley offers eight spectacular chains of lakes. These lakes formed during the period of high rainfall in the quaternary era when much of the world near the poles was covered in ice. During this time the northern four lakes Ziway, Langano, Abyjata and Shalla were one and the southern two Abaya and Chamo were one. As the earth's climate warmed in comparatively recent geological times the rift valley lakes receded leaving extensive deposits of sedimentary rocks. The Ethiopian Rift Valley offers eight spectacular chain of lakes. These lakes formed during the period of high rainfall in the quaternary era when much of the world near the poles was covered in ice.

During this time the northern four lakes; Ziway, Langano, Abyjata and Shalla were one and the southern two Abaya and Chamo were one. As the earth's climate warmed in comparatively recent geological times the rift valley lakes receded leaving extensive deposits of sedimentary rocks

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