是“层峦叠嶂”吧？

层峦叠翠means there are lots of mountains with numerous green trees,是不是很清楚了？呵呵

层峦：山连着山；叠翠：许多高险的像屏障一样的山。形容山峰多而险峻。形容山上的树层层叠叠，郁郁葱葱。

山峰重叠，连绵不断，简单点说，就是很多很多山连在一起，没有间断

Literally means: mountain and trees are cascaded like layers. I think the following picture makes a good example of 层峦叠翠 http://www.ilvping.com/data/uploads/upload/2012/07/0713180333525796b.jpg