Definition of rift valley noun from the Oxford Advanced Learner's Dictionary

 

rift valley

 noun
noun
BrE BrE//ˈrɪft væli//
 
; NAmE NAmE//ˈrɪft væli//
 
Mountains and valleys
 
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a valley with steep sides formed when two parallel cracks develop in the earth’s surface and the land between them sinks See related entries: Mountains and valleys
See the Oxford Advanced American Dictionary entry: rift valley