The Pacific Coast-Olympic Peninsula region is known for its flat coastal plains, rugged seacoast, scenic mountain peaks, and the highest annual rainfall in the lower forty-eight states. The Olympic Mountain Range and the Willapa Hills to the south are fully exposed to the brunt of Pacific Ocean storms, resulting in lush forests of Douglas-fir, western hemlock, and western red cedar. The temperate rainforest on the west slope of the Olympics receives more than 100 inches of rainfall each year.

Wildlife identified with the region include Roosevelt elk, black bear, the northern spotted owl, the California gray whale, and thousands of ducks, geese, shorebirds and marine birds, which migrate along the Pacific Flyway to breed on offshore islands or feed in the large coastal estuaries of Grays Harbor and Willapa Bay.