A large proportion of the Lewis Hills is composed of peridotite, a rusty brown rock containing iron, magnesium, chromium and nickel in such concentrations that the sparse soil is almost toxic to plant life. There are, however, several species that cling to life in this hostile environment. Alpine campion, sandworts, maidenhair fern, sea thrift, moss campion, and lapland rosebay are but a few. At 815 metres above sea level, the Lewis Hills are the highest on the island of Newfoundland. Arctic hare can be seen grazing the sparse vegetation among the boulders.
Caribou seek relief from the summer heat on the snowfields.
Moose raise their young in the secluded valleys of the lowlands. Ptarmigan, perfectly camouflaged, will scarcely move as you pass. The Lewis Hills are accessible only on foot. Trails are nonexistant. The terrain is rugged and sturdy footwear is recommended.