Definition of Great Rift Valley in English:

Great Rift Valley

Syllabification: Great Rift Val·ley
A large system of rift valleys in eastern Africa and the Middle East, the largest in the world, that runs for about 3,000 miles (4,285 km) from the Jordan valley in Syria into Mozambique. It is marked by a chain of lakes and a series of volcanoes, including Mount Kilimanjaro.

Definition of Great Rift Valley in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous