tree·line
noun/ˈtriːlaɪn/
/ˈtriːlaɪn/
(also tree line)
[singular]- a level of land, for example on a mountain, above which trees will not grow
enlarge image林线（山上等树木生长的上限） - There’s still some snow above the treeline.
树线上方还有一些积雪。
- There’s still some snow above the treeline.