boreal forestnoun [ S or U ]
uk/ˌbɔː.ri.əlˈfɒr.ɪst//ˌbɔːr.i.əlˈfɔːr-/also taiga specializedthe very large area of wet land in the far northern parts of the world that is covered with conifer trees:
The petroleum industry isn't the only potential threat to Canada's boreal forest.