This is a large, complex region of mountains, broad plateaux, plains, basins and trenches. We found the Yukon Plateau, Cassiar Mountains, Skeena Mountains, Liard Plain, Hyland Plateau and Pelly Mountains. Several major rivers have carved deep canyons. Boreal forest dominates the region. Black spruce, black spruce, white spruce and lodgepole pine are most common species.
Subalpine firs stand alone or in tight groves at the line.
Broad belts of alpine tundra are found throughout the region at higher elevations. Moose, caribou, elk, Dall's Sheep, mountain goat, wolf, wolverine, black bear thrive in this region. No national parks have yet been established in this region.