Ghost River Wilderness Area consists of rugged mountain terrain and glacier-carved valleys. Aylmer, Apparition, Oliver and Costigan mountains reach elevations of 2743 to 3353 metres. Below 2100 metres there are sub-alpine forests of Engelmann spruce, white spruce, fir and lodgepole pine; above 2100 metres are grasses, sedges and wildflowers. Many rare species of butterflies are found in the area. Wildlife includes bighorn sheep, deer, moose, cougar, bears and wolves.