在一篇关于肯尼亚茶园的文章中
Emerald-green estates stretch as far as the eye can see,
hugging the western escarpment of the Rift Valley. Set 7000
feet above sea level, the climate is perfect for growing tea,
Kenya's biggest export, which fetched $1.4bn last year.
For Paul Chepkwony, the governor of Kericho County, these
plantations are a reminder of the way the British stiffed
his Kipsigis tribe of their land.
请问第二行中的escarpment要怎么理解比较好呢？
(字典查到的意思有“擒纵机构（打字机上控制行距的）棘轮装置；脱逃；逃路”)
谢谢!