Set in the middle of Georgian Bay's 30,000 Islands, Killbear sits on the southern edge of the Canadian Shield, which accounts for the dramatic and unspoiled landscape. The gentle sand beach is perhaps the finest on the eastern shore of Georgian Bay. Elsewhere the coastline is steep and jagged and along the entire shoreline the point features wind-swept pine. Northern hardwoods compete with southern deciduous trees like maple and beech. Black spruce and cedar occupy the wet boggy areas and rock outcrops, and hemlock is found on the southern slope of the central ridge. A few hills, vestiges of ancient mountains, roll across a landscape that is otherwise flat and scrubbed clean by glaciers. Bald outcroppings of rock and exposed patches of bedrock are comparable in age to the rock found at the bottom of the Grand Canyon, possibly the oldest exposed rock on the planet.

Rare or endangered species of snake and turtle are found in the park in a sedge meadow environment. Other protected habitats include a black spruce bog, a floating sphagnum bog, and the park's remaining sand dunes.